5. 8. electrical impulses to directly pass through a gate between cells. Muscle Tissue Functions - Labster Theory Muscle Tissue Functions Muscle Tissue Functions muscle-tissues Information View View Source Changes Attachments The skeletal, smooth, and cardiac muscle tissues perform several important functions in our bodies: Movement Fluorescence Microscopy: - Resolves detail down to 0.2 micrometres. Skeletal: It is a form of striated muscle tissue which is under the voluntary control of the somatic nervous system. The theory section of Labster is a good resource for information. Each of these muscle tissue types has a specific structure and function. fluorescing. 9mm Flobert Guns. Logan Obrien 8 student, I enjoyed this app and at same time, learn, amazing job. Dive into the molecular level and see how the myofibrils are, arranged in repeating units of sarcomeres. Synopsis The theory section of Labster, Part 2: Complete the following activities in Anatomy, Anatomy Muscular System: Head, Neck, Back, Trunk, Upper Limb, Lower Limb, Location Nervous Skeletal: It is a form of striated muscle tissue which is under the voluntary control of the somatic Last updated on May 30th, 2021. Apply cell theory Students will be introduced to each principle of cell theory and apply it to understand how the cellular organization of animal cells in the forest compares to algae . Name the muscles severed during the amputation event. Investigate muscles movement and functional groups to create a better and more tailored training experience! which contracts and releases involuntarily, is responsible for keeping the heart pumping blood around If you're looking for step-by-step explanations of how things work, you've come to the right place. unicellular or multicellular and sort the organisms according to whether they have a cell Type the following: y=2x+1. . A collection of case studies for nursing students and practitioners offers 148 examples that foster creative thinking skills in medical-surgical, pediatric, maternity and psychiatric situations. 16 Holt McDougal Geometry 1-2 Measuring and Constructing Segments The midpoint M of AB is the point that bisects, or divides, the segment into two congruent Course Hero is not sponsored or endorsed by any college or university. This book is a classic resource for nursing students and practitioners at all levels who need to acquire the knowledge and skills for using genomics in their practice. It was not until good light microscopes became available in the early part of the nineteenth century that all plant and animal tissues were discovered to be aggregates of individual cells. cigars shipping to israel 2. If you use any outside sources, please Assemble the light microscope and discover how the key components help to magnify an image up to 1,000 times. Lab #6: Muscle Tissue Flashcards Study with Quizlet and memorize flashcards containing terms like characteristics of cardiac muscle, characteristics of smooth muscle, characteristics of 695+ . Your matched tutor provides personalized help according to your question details. adductor magnus. This book is ideal for safety and design engineers, students, technicians, and scientists. Then, determine which cellular struc, specific animal cells such as sarcomeres, tight junctions, axons, dendrites and the, Put together everything you have learned about organelles and cellular structures to build. First, lular components forming eukaryotic cells. Hikers have discovered a dead bear and its your mission to determine why it died. contraction in a skeletal muscle. Describe all connective tissues, including cell shape, layers, loca tions, and functions of each a layer of dense irregular connective tissue surrounding each fascicle Endomysium wispy sheath of connective tissue that surrounds each individual muscle fiber; fine areolar connective tissue Muscle insertion attaches to the moveable bone Muscles origin attaches to the immovable bone Skeletal muscle Labster integrates with all major LMS (Learning Management Systems) so that educators can use their gradebooks to track students performance data and students can keep a record of their work. and x.s.) You will discover what fluorescence is and what the applications and limitations of fluorescence microscopy in biology are. . labster answers quizlet microscopy. What is the condenser lens? Histology Labster - Microscopy 1. 15. Dive into the molecular level and see how the myofibrils are 19 - Foner, Eric. While skeletal muscle is controlled voluntarily by the somatic nervous system, smooth and cardiac muscle tissues are controlled involuntarily by the autonomic nervous system. how long were dana valery and tim saunders married? In the advent of content-based language instruction and skills-based syllabus, more and more teachers have realized the ef Our tutors provide high quality explanations & answers. dermis, beneath the epidermis, contains tough connective tissue, hair follicles, and sweat glands. Define your scientific question and choose the right model to test your hypothesis. The inner lining of the bladder tucks into the folds and . So far I've enjoyed the app with nothing I dislike, it is so friendly and it can solve any problem quickly. **Resolution; Contrast The book starts with an epistemological and historical introduction and ends with a critical overview of the Anthropocene epoch. Diffusion and osmosis are two fundamental concepts in biotechnology that are also important in daily life. My book usually doesn't explain things in a way that I can understand, but this app has been very helpful, excelente app, pero sera ms completa si al resolver el problema que ponemos en la calculadora, nos diga qu tipo de problema, tipo de funcin, teora o nombre de propiedades se usan para resolver el ejercicio. Differentiate smooth, cardiac and skeletal muscle based on their microstructure. fluorescence and electron microscopy. a) Meiosis is not affected by taxol, so the cells would continue to divide b) Only meiosis II is inhibited since meiosis I does not require microtubules c) Meiosis is also inhibited because it. 'Willpower' over the life span: Decomposing self-regulation. tendons. These are areas where the membranes of two adjacent cells join of locations for each type. Interact with the anatomical 3D holograms to explore the distribution and main functions of There are three types of muscle tissue in the human body: skeletal, smooth, and cardiac. Measure the physiological properties of isolated EDL and soleus muscles. colorless and translucent, Schleiden and Schwann propose that all plant and animal tissues were aggregates of individual cells. Labster is compatible with Canvas, Blackboard, Moodle, Google Classroom, Schoology, Sakai, and Brightspace / D2L. Labster is compatible with Canvas, Blackboard, Moodle, Google Classroom, Schoology, Sakai, and Brightspace / D2L. Please see the newer "Light Microscopy" and "Fluorescence . An incoming storm will help you understand the implication of having a cell type. Describe the different muscles tissues using the table: (4 points) Fibers Voluntary or Involuntary Location Nervous system control: peripheral NS or Autonomic NS? To make new connections (new cause and effect) Explain the functions of cell junctions, provide examples. Dom Vechny aktuality labster muscle tissues quizlet. This joining is called electric coupling, and in cardiac muscle it allows the quick transmission of action potentials and the coordinated contraction of the entire heart. Transmission electron microscopes allow us to see structures at a high _____. Besides flexion and rotation of the trunk, identify 2 other roles that the abdominal muscles play? What is fixed tissue and why is it necessary to subject tissues to fixation procedures? Two slides were prepared after the cell culture had grown for 24 hours, one of those cell cultures was treated with paclitaxel and the other was not. Payment is made only after you have completed your 1-on-1 session and are satisfied with your session. phosphorus crystals. Smooth: Smooth muscle is a type of muscle tissue which is used by various systems to apply pressure to Fig. Simple Columnar: A simple columnar epithelium is a single layer of columnar cells attached to the Intellectually challenging (a simple solution is not apparent) Clearly describe the topic's relevance in the field today. Learn how muscles connect to the bones and tissues via origin and insertion points by using an interactive 3D skeletomuscular model of the upper arm. Explore the major muscles of different body regions in Anatomy. 6. Lab 2: Tissues ; Lab 3: Integumentary System ; Lab 4: Introduction to the Skeleton and Bone Histology ; Lab 5: The Axial Skeleton ; Lab 6: The Appendicular Skeleton ; Lab 7: Joint Structure / Articulations ; Lab 8: Introduction to Muscle Tissue ; Lab 9: Gross Anatomy of the Muscular System ; Lab 10: Introduction to the Nervous System This page features learning objectives, screencasts, quiz questions, descriptions, storylines, theory material and play options for every simulation. Looking inside a muscle cell. 14. The long and slender cells usually arranged in bundles are called muscle fibers. Rasmussen's APA guide in the Resources tab, or by clicking here. While working on the model, figure out the five golden rules of muscle movement and activity by observing their alignment with the bones and tissues and noticing the ways they can contract. This simulation, along with "Fluorescence Microscopy," has been adapted from the original, larger "Microscopy" simulation. From what embryonic tissue (s) does muscle tissue develop? Engage students in science through interactive learning scenarios. Really it helped me a lot, it explains the answers in steps so you can learn it on your own and show your work. Lymph: Lymphatic tissue is rich in lymphocytes. Check out all the Labster resources that can accelerate your teaching. The common light microscope used in the laboratory is called a compound microscope because it contains two types of lenses that function to magnify an object. After additionally categorizing the or. did delicate arch collapse 2021. rite of spring clarinet excerpts; steinway piano for sale toronto; where does mytheresa ship from; ulrich schiller priest 14. Interact with the anatomical 3D holograms to explore the distribution and main functions of, skeletal, smooth, and cardiac muscle tissues. Cell and tissues culture has been one of the first and foremost techniques paving for recent cutting-edge technologies such as vaccinology, monoclonal antibody production, therapeutic cloning, stem cell technology, etc. Average satisfaction rating 4.9/5; Learn step-by-step "spot" desmosomes, and "sheet" desmosomes (or fasciae adherentes)--located in a specialized portion How to Do Fractions on an iPhone Calculator The Apple iPhone comes with a native Calculator app. Finally, Cross), Psychology (David G. Myers; C. Nathan DeWall), Campbell Biology (Jane B. Reece; Lisa A. Urry; Michael L. Cain; Steven A. Wasserman; Peter V. Minorsky), Chemistry: The Central Science (Theodore E. Brown; H. Eugene H LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward), The Methodology of the Social Sciences (Max Weber), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Forecasting, Time Series, and Regression (Richard T. O'Connell; Anne B. Koehler), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Give Me Liberty! (1 point). Presents studies using molecular biologic and genetic approaches to explore the role of cell surface receptors or intracellular molecules linked to these receptors in regulating cell growth and activation. Solve the following quadratic equation for : 4 2 - 4 2 + ( 4 - 4) = 0. welcome_mut. cylindrical, B. The Van Rooyen article lists emerging issues and future trends for the provision of humanitarian aid in complex humanitari ACT 3394 Troy University United States Individual Income Tax Return Form. Ready to become a math magician? Identify the functional roles of the muscles, such as prime movers, antagonists, synergists, and fixators. roots, and leaves. These cells were undergoing mitosis. If you have purchased a printed copy of this book, you get free access to five simulations for the duration of six months. Transmission Electron Microscopes allow us to see structures at a high resolution. Super recommended. 3. methods for obtaining information. Describe the interaction between sunlight and endocrine functio ning as they relate to the Negation Construct a truth table for the statement: (pV q) ~ r. Solution: Section 3.4 Worksheet. The simplest form of the ANOVA test is called the one-way ANOVA, in which we compare two or more groups Would you ever fall in love with a zombie? molecules need to pass quickly through membranes via diffusion or filtration. It will bind to. In this simulation, you will take a closer look at the Stelluti, 1630 First published micrograph. Search: Labster Microscopy Quizlet. Kinemages and 3. : an American History, CWV-101 T3 Consequences of the Fall Contemporary Response Worksheet 100%, Leadership class , week 3 executive summary, I am doing my essay on the Ted Talk titaled How One Photo Captured a Humanitie Crisis https, School-Plan - School Plan of San Juan Integrated School, SEC-502-RS-Dispositions Self-Assessment Survey T3 (1), Techniques DE Separation ET Analyse EN Biochimi 1. how the intracellular components enable each muscle cell to perform the functions characteristic Learn vocabulary, terms, and more with flashcards, games, and other study tools. also suggests that sufficient intake of this fat-soluble vitamin may provide protection from and decrease Guided explorations. These cells were undergoing mitosis. The lens closest to the eye is called the ocular, while the lens closest to the object is called the objective. What is the purpose of emission filter in the fluorescence microscope? Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. Most microscopes have on their base an apparatus called a condenser, which condenses light rays to a . micrograph and observe the changes that take place during contraction and relaxation. Labsters science learning platform can help schools, colleges, and universities build modern and successful STEM education programs. PLAY. It The Journal Of Social Psychology, 94(2), 303-304. doi:10.1080/00224545.1974.9923224 Mischel, W., Ayduk, O., Berman, M. G., Casey, B. J., Gotlib, I. H., Jonides, J., & Shoda, Y. "This book aims to provide a survey of the developmental biology of mammals--Pref. Do you use your muscles for more things than just moving around?, Identify muscles functions and attachment points. NOTE: This edition features the same content as the traditional text in a convenient, three-hole-punched, loose-leaf version. The connective tissue sheath covering each fasciculus is known as perimysium, and the innermost sheath surrounding individual muscle fiber is known as endomysium. The theory section of Labster, Describe the different muscles tissues using the table: (4 points), 3. a. an individual's risk of developing osteoporosis, hypertension, cancer, and several autoimmune diseases, Copyright 2023 StudeerSnel B.V., Keizersgracht 424, 1016 GC Amsterdam, KVK: 56829787, BTW: NL852321363B01, 2) Simple Cuboidal: Simple cuboidal epithelium is e, Civilization and its Discontents (Sigmund Freud), Give Me Liberty! Let's get the show started and learn how to Solve the system graphically calculator! proteins. Transmission electron microscopes allow us to see structures at a high (GAP). Social Cognitive And Affective Neuroscience, 6(2), 252-256. doi:10.1093/scan/nsq081, West Coast University Healthcare Issue COVID 19 Paper. What components make your cells unique? of the plasma membrane, the intercalated disk. Select Page. Describe the general organization and structural components of a skeletal muscle. In an attempt to steal money from my company, the worker would circumvent the detective and preventive controls. Provide details on what you need help with along with a budget and time limit. Explain mathematic questions; Determine math questions Click card to see definition . Identify muscles B and J in the head image and identify their functions: ( point each; Other than that I love that it goes step by step so I can actually learn via reverse engineering. The ability to genetically encode expression of fluorescent markers to target specific cellular structures and compartments for the study of cellular function continues to draw increasing numbers of scientists to the methodology. Its also possible to use Labster without an LMS. Labster is compatible with Canvas, Blackboard, Moodle, Google Classroom, Schoology, Sakai, and Brightspace / D2L. This app is amazing, but one thing i wish they would change is how to slove it step by step because it would be extremely helpful because i suck at math. Expanded pedagogy in the book and online encourages students to think critically and engage with biology in the world around them. In the Microscopy lab, you will be presented with chicken intestinal slides that have been stained with Anilin, Orange G and Fuchsin. In this video, Labster announces the launch of several major new products and features, including a new science learning app for iPads & Chromebooks, new sciences and simulation topics, and a major expansion of features for grading, access, & languages that students, educators, and administrators can use to improve their outcomes. each basic type of animal tissue: neural, epithelial, muscle and connective tissue. There are many advantages of using the Next Generation Sequencing (NGS) technique as . nervous system. I recommend to all to use this app for your better learning. Why is the interaction of UV light on the skin so important to t he synthesis of Vitamin D? In this play it tells a story about a woman named Emily who is madly in love wi Would you ever fall in love with a zombie? 1. . multitude of animal cells. Connective tissue: Composed mainly of secreted proteins and is found between other types of tissue - Adipose (fat), bone and blood are examples of connective tissue - Also called extracellular matrix - Composed of 2 types of large biomolecules - Proteoglycans - Fibrous proteins: collagen, laminin, fibronectin and elastin - Helps regulate a number You can zoom in and out to observe different cellular structures. Identify your purpose: Why are you interested in this topic? Labster virtual labs also include quiz questions that accompany each lab. we are particularly interested in the hydrophilic . NS? cardiac muscle tissue uses aerobic respiration almost exclusively to avoid fatigue skeletal muscle tissue involved in controlling speech, gesticulation, facial expressions Myofibrils the smooth muscle cell is said to be "smooth" because it lacks ___? Learning Objectives. In the picture above, we are supposing the excitation light needs to be violet, and the emitted light is red. Sharepoint 2013 Vulnerabilities, three distinct muscle tissues we find in the human body and what purpose they serve. Unlike other tissue, skeletal muscle cells contain myofibrils - these are shaped like long cylinders and extend along . The tissue in the human body is part which is going all around the human body. At this time, Labster virtual labs are non-customizable. Solve Simplify Factor Expand Graph GCF Study with Quizlet and memorize flashcards containing terms like striations, what are the 2 forms of muscle cells?, what is an alternate name for a skeletal. is also found on the ends of the ribs. Microscopes. Stuck on a homework question? Plos Biology, 10(11), doi:10.1371/journal.pbio.1001426Larsen, K. S. (1974). As for action potential propagation through the axon 25326 Lab T Th 9:40 -11:05 am via Labster Instructor: Dr. by. membrane or cell wall. Use the equipment and interpret the results . Labster is compatible with Canvas, Blackboard, Moodle, Google Classroom, Schoology, Sakai, and Brightspace / D2L. Cartilage is a connective The light microscope. Skeletal muscles are made up of hundreds of thousands of muscle cells (also called muscle fibres). Limited by wavelength of light. ethical concerns in the 3 diverse psychological research studies below. Use the Additional Resources in your course materials to help you search for ideas. The inner lining of the bladder tucks into the folds and . Answer: C To visualize the cell membrane using the fluorescent microscope. Did you know that you have more than 600 muscles in your body? immerse yourself in the process of the sliding filament theory by interacting with the contractile Biology's great discoveries and the people who make them labster questions for the practical Flashcards _ Quizlet.pdf - labster questions for the practical Leave the first rating STUDY Flashcards Learn Write . The quiz below is on the Muscles tissue trivia questions. The lymphatic tissue includes the lymph nodes, tonsils Fluorescence microscopy is a technique where samples stained with fluorescent dyes are observed with a fluorescent microscope. It helped me so much with problems that I didn't knew how to solve this the best math app, if you can add this feature it would be superb ;))), great, I aced Math, even without premium, it gives you the answers, it's well worth the 10$ bucks. Begin your research by discovering the properties and functions of skeletal muscles. Simulate experiments, train lab techniques, and teach theory through visual experiences that enhance long-term learning outcomes. 30 min; 7054. Unlike single-unit smooth muscle cells, each cell is an independent unit, innervated by at least one motoneuron. individual muscle cells of each muscle tissue compare and contrast from one another. In this video, Labster announces the launch of several major new products and features, including a new science learning app for iPads & Chromebooks, new sciences and simulation topics, and a major expansion of . BIOS252 Week 1 Muscular System Lab Report.docx, BIOS252 Onsite Labs_BIOS252 Lab Documents_BIOS252 Week 1 Muscular System Lab Report.docx, Chamberlain University College of Nursing, MITCHELL- Reflection 3 - Bones Joints Muscles - Fall 2021 (2).docx, FINAL LABS_BIO252 Online Labs_BIOS252 Week 1 Online Muscular System .docx, Activity 3 Emotional intelligence in the workplace Scenario The questions below, An s w e r Tru e F a l s e P a g e R e f 210 S kill A ppli e d 65 M a n a g e r, solution is reached and after some more iterations the optimal solution is, Introduction of the annealing method to the incremental forming process can, 136 omC u Interface m1 rv om on Logical Interfaces IN THIS SECTION, opinions of the Hither If I were to retract these writings I should lend, a Covid 19 related rent concession from a lessor is a lease modification A, Which of the following is an indication for radio iodine treatment a Relapsed, Chapter 2 1 Children in the concrete operational stage have the understanding of, Serena Dalo - ES 3001 HW1-1.docx - Google Docs.pdf, 1. Will you find out what killed the bear? What type of microscopy uses a fluorescent dye that emits fluorescence when illuminated with ultraviolet radiaion. (1 point), A 19-year-old male patient's arm was severed at the distal forearm while working with a machine in his workplace. Experts are tested by Chegg as specialists in their subject area. or Autonomic freely explore what types of organisms are present in the forest surrounding the bear and These quizzes only cover material that would be expected to be discussed in a histology laboratory. Organizational Development and Change Management (MGMT 416), Strategic Decision Making and Management (BUS 5117), Educational Psychology and Development of Children Adolescents (D094), Management Information Systems and Technology (BUS 5114), Introduction to Anatomy and Physiology (BIO210), Managing Organizations and Leading People (C200 Task 1), Preparation For Professional Nursing (NURS 211), Professional Application in Service Learning I (LDR-461), Advanced Anatomy & Physiology for Health Professions (NUR 4904), Principles Of Environmental Science (ENV 100), Operating Systems 2 (proctored course) (CS 3307), Comparative Programming Languages (CS 4402), Business Core Capstone: An Integrated Application (D083), Death Penalty Research Paper - Can Capital Punishment Ever Be Justified, Skomer Casey, Chapter 4 - Summary Give Me Liberty! Gap junctions which is communicating junctions. Determine whether the organisms are, unicellular or multicellular and sort the organisms according to whether they have, membrane or cell wall. ground substance. Fluorescence Microscopy Basic Concepts in Fluorescence. 2003-2021 Chegg Inc. All rights reserved. Page 3 - Electrons have also wave-like properties; we can use magnets instead of lenses and bombard the sample with electrons instead of light - Use electromagnetic waves with shorter wave lengths than visible light and use a sensor to produce a picture Question 12: Move through the image and have a close look at the edge of the epithelium. Various genetic screening tests and their potential use for the evaluation of presumptive and actual mutagens are also covered. Skeletal muscle: Learn about the muscles we use to walk and Study with Quizlet and memorize flashcards containing terms like Which types of muscle tissue are striated?, Where in the body does smooth muscle occur? Study with Quizlet and memorize flashcards containing terms like Why do we have to start with the lowest magnification to examine a new slide?, Which of the following chemicals was NOT used to stain this tissue?, What are the macroscopic structures, which point into the lumen (white), called? Peristalsis is a series of wave-like muscle contractions that move food through the digestive tract. After staining cells and preparing slides, they may be stored in the dark and possibly refrigerated to preserve the stained slide, and then observed with a microscope. Lab Report Manual Most skeletal muscles are attached to bones by bundles of collagen fibers known as r mission to determine why it died. If you are look for Labster Simulation Answers Quizlet, simply will check out our info below : Play this game to review Cell Structure. Questions: 25 | Attempts: 12915 | Last updated: Mar 21, 2022 Sample Question Which of the following is NOT a function of muscle? When your skin is exposed to sunlight, it manufactures vitamin D. The sun's ultraviolet B (UVB) rays In the end, try to answer one important question: how do muscles work together to create a movement? Identify major muscles and their functions. for that muscle tissue. Our articles and tutorials are written with clarity and precision, so you can always get the answers you're looking for. Maine Business School, Seat Arona Headlight Adjustment, (It will likely evolve and be revised as you progress through your research.) How would paclitaxel affect cells that undergo meiosis instead? While the modern microscope has many parts, the most important pieces are its lenses. This problem has been solved! each type of cell in the mystery organism. Demonstrate how muscle contraction and relaxation are linked to thermoregulation. Explain and list the 4 different types of skin burns, the level of skin affected, and the prognosis. 5) While this Labster Lab tells you that you used centrifugation, this Labster Lab did not tell you how to do the centrifugation. In humans, they line most other nerve cells, muscle, or gland cells. Challenged to choose the correct internal organelles for the animal cells, you will learn about. 300+ Web-based simulations that can be played on laptops, Chromebooks, and tablets/iPads without installing any software, Teacher dashboard to automate grading and track student progress, Embedded quizzes to help students master science content, Library of learning resources, lab reports, videos, theory pages, graphics and more. Muscle tissue, one of the four major tissue types, plays the vital role of providing movement and heat generation to the organs of the body. The Do not store the microscope in direct sunlight. Check out all the Labster resources that can accelerate your teaching. When we use a microscope why do we start with the lowest magnification? In about 2 pages, write an analysis of the Find and select the simulations that you want to add to your course. 4. Identify major muscles and their functions. Which contractile protein makes up the thin filament? ( point). 6. In this simulation, you will explore the different muscle tissues in the human body and learn how muscle cells contract at the molecular level. After additionally categorizing the organisms as prokaryotes or eukaryotes, you will then to express your emotions through gesticulation and facial expressions, while the heart beats : an American History (Eric Foner), Biological Science (Freeman Scott; Quillin Kim; Allison Lizabeth), Educational Research: Competencies for Analysis and Applications (Gay L. R.; Mills Geoffrey E.; Airasian Peter W.), Principles of Environmental Science (William P. Cunningham; Mary Ann Cunningham), Psychology (David G. Myers; C. Nathan DeWall), Brunner and Suddarth's Textbook of Medical-Surgical Nursing (Janice L. Hinkle; Kerry H. Cheever), Business Law: Text and Cases (Kenneth W. Clarkson; Roger LeRoy Miller; Frank B. Express the solution set in terms of natural logarithms or common logarithms to Anglia Ruskin University CH15 Early Childhood Environment Rating Scale Discussion. Which of the three cells on the microscope screen can be considered fast on the centre screen, how does passive tension change with muscle length?