Sarcomere Anatomy and Function
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Questions and Answers

What is a sarcomere?

  • The basic contracting unit of skeletal muscle (correct)
  • A type of protein filament
  • The entire skeletal muscle
  • A type of myofibril
  • What is a myofibril composed of?

  • Skeletal muscles
  • Contractile units
  • Series of protein filaments (correct)
  • Z discs
  • What is the function of a sarcomere?

  • To generate force (correct)
  • To store energy
  • To transmit nerve impulses
  • To regulate muscle length
  • What is shared between adjacent sarcomeres?

    <p>Z discs</p> Signup and view all the answers

    What is the arrangement of sarcomeres in a myofibril?

    <p>Laid end to end</p> Signup and view all the answers

    What is the main function of actin filaments in a sarcomere?

    <p>To attach to Z lines and extend towards the centre of the sarcomere</p> Signup and view all the answers

    What type of filaments appear to float in the middle of a sarcomere?

    <p>Thick myosin filaments</p> Signup and view all the answers

    What is the name of the disc shared by adjacent sarcomeres?

    <p>Z line or Z disc</p> Signup and view all the answers

    How are myosin filaments arranged in a sarcomere?

    <p>In between parallel actin fibres</p> Signup and view all the answers

    What is the repeating unit of a myofibril?

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

    What is the name of the protein filament that can attach to Z lines in a sarcomere?

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

    Where do myosin filaments primarily appear in a sarcomere?

    <p>Floating in the middle of the sarcomere</p> Signup and view all the answers

    What is the function of myosin cross bridges in a sarcomere?

    <p>Walk the filaments past each other</p> Signup and view all the answers

    What is the name of the disc that adjacent sarcomeres share?

    <p>Z line</p> Signup and view all the answers

    What is the sliding filament theory used to explain in muscle contraction?

    <p>Cross bridge attachment and movement of filaments</p> Signup and view all the answers

    What is the mechanism by which muscle fibres contract?

    <p>Myosin filaments slide past actin filaments</p> Signup and view all the answers

    What is the role of little heads on myosin filaments?

    <p>To bind to actin filaments</p> Signup and view all the answers

    What is the analogy used to explain muscle contraction?

    <p>Rowing a boat</p> Signup and view all the answers

    What is the result of the interaction between myosin and actin filaments?

    <p>Muscle contraction</p> Signup and view all the answers

    What is the term used to describe the sliding of filaments past each other?

    <p>Sliding filament theory</p> Signup and view all the answers

    What happens when the little heads on myosin filaments bind to the adjacent filament?

    <p>The myosin filaments move past the actin filaments</p> Signup and view all the answers

    What is the purpose of the sliding filament theory?

    <p>To explain how muscle fibres move past each other</p> Signup and view all the answers

    What is the analogy used to explain the sliding filament theory?

    <p>Oars pushing water past a boat</p> Signup and view all the answers

    What is the net result of the interaction between myosin and actin filaments?

    <p>Muscle contraction</p> Signup and view all the answers

    What is the role of myosin filaments in the sliding filament theory?

    <p>They move past the actin filaments</p> Signup and view all the answers

    What are the four main tissue types found in many different organ systems and structures?

    <p>Epithelial Tissue, Nervous Tissue, Muscle Tissue, Connective Tissue</p> Signup and view all the answers

    What type of tissue is muscle tissue classified as?

    <p>Muscle Tissue</p> Signup and view all the answers

    How many main tissue types are found in many different organ systems and structures?

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

    What is NOT one of the four main tissue types?

    <p>Blood Tissue</p> Signup and view all the answers

    What do the four main tissue types include?

    <p>Epithelial, Connective, Muscle, and Nervous Tissue</p> Signup and view all the answers

    What surrounds muscle fibers themselves?

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

    What is the outer covering of the entire muscle?

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

    What type of tissue surrounds muscle tissue?

    <p>Connective Tissue</p> Signup and view all the answers

    What is the term for the bundles of muscle fibers?

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

    What connects muscle to bone or other muscles?

    <p>Both A and B</p> Signup and view all the answers

    What is the outermost layer that covers the entire muscle?

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

    Which layer of connective tissue surrounds the bundles of muscle fibers called fascicles?

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

    What type of tissue is continuous with the tendons or aponeuroses that connect muscle to bone or other muscles?

    <p>Connective Tissue</p> Signup and view all the answers

    What is the middle layer of connective tissue that starts around muscle fibers themselves?

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

    Which connective tissue layer surrounds muscle fibers directly?

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

    What is the primary function of connective tissue in skeletal muscle?

    <p>To hold the muscle fibers together and to its surrounding structures</p> Signup and view all the answers

    What can be found in the connective tissue layers surrounding skeletal muscle fibers?

    <p>Blood vessels, nerve fibers, and adipose tissue</p> Signup and view all the answers

    What is the purpose of connective tissue in reducing friction in skeletal muscle?

    <p>To reduce friction caused by muscular forces</p> Signup and view all the answers

    What is the role of adipose tissue in skeletal muscle connective tissue layers?

    <p>To store energy for muscle contraction</p> Signup and view all the answers

    What do the connective tissue layers help skeletal muscle fibers do?

    <p>Move smoothly and efficiently with surrounding structures</p> Signup and view all the answers

    Connective tissue in skeletal muscle fibers primarily serves to hold the components of the muscle together.

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

    Adipose tissue is not present at all in the connective tissue layers surrounding skeletal muscles.

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

    The connective tissue layers around skeletal muscle fibers do not contain blood vessels or nerve fibers.

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

    Skeletal muscle fibers cannot exert a large force when they contract without being firmly fixed together.

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

    The main function of connective tissue in skeletal muscles is to create friction between muscular forces.

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

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