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Muscular System Functions and Anatomy Quiz
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Muscular System Functions and Anatomy Quiz

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Questions and Answers

What is the basic structural and functional unit of the skeletal muscle?

  • Myofibril
  • Tropomyosin
  • Sarcoplasmic reticulum
  • Sarcomere (correct)
  • Which part of the muscle fiber contains the T tubules or transverse tubules?

  • Sarcomere
  • Sarcoplasm
  • Sarcoplasmic reticulum
  • Sarcolemma (correct)
  • What is the network of protein fibers that forms a stationary anchor for actin myofilaments to attach?

  • Z disc (correct)
  • Sarcoplasm
  • A band
  • I band
  • Which part of the muscle fiber contains high concentration of calcium ions important in muscular contraction?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

    What are the tube-like inward folds of the sarcolemma called?

    <p>T tubules</p> Signup and view all the answers

    What is the cytoplasm of the muscle fiber called?

    <p>Sarcoplasm</p> Signup and view all the answers

    What causes the myosin filaments to move, exposing the attachment site on the actin myofilaments?

    <p>Presence of calcium</p> Signup and view all the answers

    What extends from one Z disc to the next Z disc in a muscle fiber?

    <p>Sarcomere</p> Signup and view all the answers

    What is the endoplasmic reticulum of the muscle fiber that contains high concentration of calcium ions important in muscular contraction?

    <p>Sarcoplasmic reticulum</p> Signup and view all the answers

    Which bundle of protein filaments are found in the sarcoplasm?

    <p>Actin myofilaments</p> Signup and view all the answers

    What is the function of the muscular system responsible for overall movement of the body?

    <p>Movement of the body</p> Signup and view all the answers

    Which property of muscle tissue refers to its ability to shorten forcefully or contract and lengthen passively?

    <p>Contractility</p> Signup and view all the answers

    What characteristic gives skeletal muscle its name due to the presence of transverse bands or striation?

    <p>Skeletal muscle structure</p> Signup and view all the answers

    Which type of muscle is involved in speaking, writing, typing, gesturing, and facial expressions?

    <p>Skeletal muscle</p> Signup and view all the answers

    What is the capacity of the muscle to respond to a stimulus known as?

    <p>Excitability</p> Signup and view all the answers

    Which connective tissue sheath forms the outer covering of the muscle and is subdivided into numerous bundles called fascicles?

    <p>Epimysium or muscular fascia</p> Signup and view all the answers

    What is the capacity of the muscle to be stretched beyond its normal resting length and still be able to contract called?

    <p>Extensibility</p> Signup and view all the answers

    What is the ability of the muscle to recoil to its original resting length after it has been stretched called?

    <p>Elasticity</p> Signup and view all the answers

    What constitutes 40% of the total body weight?

    <p>Skeletal muscle structure</p> Signup and view all the answers

    What causes constriction that propels food in the digestive tract and regulates blood flow?

    <p>Contraction of smooth walls within the walls of internal organs and blood vessels</p> Signup and view all the answers

    Study Notes

    Skeletal Muscle Structure and Function

    • The basic structural and functional unit of skeletal muscle is the sarcomere.
    • T tubules (transverse tubules) are located within the sarcolemma, facilitating the spread of electrical signals.
    • The Z disc anchors actin myofilaments, providing a stationary point for attachment.
    • The sarcoplasmic reticulum contains a high concentration of calcium ions, crucial for initiating muscular contraction.
    • Tube-like inward folds of the sarcolemma are referred to as T tubules.
    • The cytoplasm of the muscle fiber is known as the sarcoplasm.
    • The movement of the myosin filaments is triggered by the interaction of calcium ions and ATP, exposing binding sites on actin myofilaments.
    • Myofibrils extend from one Z disc to the next, forming the structural framework of muscle fibers.
    • The endoplasmic reticulum of the muscle fiber, known as the sarcoplasmic reticulum, stores high concentrations of calcium ions essential for muscle contraction.
    • The myofilaments, which consist of actin and myosin, are found within the sarcoplasm, responsible for muscle contraction.

    Muscle Functionality

    • A key function of the muscular system is to enable overall movement of the body.
    • Contractility refers to muscle tissue's ability to shorten forcefully or contract and extensibility pertains to its capability to be stretched beyond normal resting length while still allowing contraction.
    • The characteristic of skeletal muscle featuring transverse bands is termed striations.
    • Skeletal muscle is involved in voluntary movements such as speaking, writing, typing, gesturing, and facial expressions.
    • The capacity of muscle to respond to a stimulus is known as excitability.

    Muscle and Connective Tissue

    • The connective tissue sheath forming the outer covering of the muscle is the epimysium, which subdivides into bundles called fascicles.
    • The ability of muscle to return to its original length after stretching is termed elasticity.
    • Skeletal muscle constitutes approximately 40% of total body weight.
    • Contraction in smooth and cardiac muscles helps propel food through the digestive tract and regulate blood flow.

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    Description

    Test your knowledge of the functions and anatomy of the muscular system with this quiz. Topics include the general properties of the muscular system, characteristics of skeletal, smooth, and cardiac muscle, skeletal muscle anatomy, and the effects of aging on skeletal muscle.

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