Muscle Contraction Mechanism
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Questions and Answers

What initiates the contraction of muscles?

  • Action potential (correct)
  • Sliding actin over myosin
  • Relaxation
  • Sarcoplasmic reticulum

What is released from the sarcoplasmic reticulum during muscle contraction?

  • Myosin
  • Sarcomere
  • Ca++ (correct)
  • Actin

What is the basic unit of muscle contraction called?

  • Sarcoplasmic reticulum
  • Sarcomere (correct)
  • Actin
  • Myosin

What is the membrane of a muscle cell responsible for regulating the entry and exit of materials?

<p>Sarcolemma (C)</p> Signup and view all the answers

Which structure in a muscle cell stores the calcium ions needed for muscle contractions?

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

What binds to actin and causes muscle contractions in a muscle cell?

<p>Thick filament (D)</p> Signup and view all the answers

What is the membrane of a muscle cell responsible for regulating the entry and exit of materials?

<p>Sarcolemma (D)</p> Signup and view all the answers

Which structure in a muscle cell stores the calcium ions needed for muscle contractions?

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

What binds to actin and causes muscle contractions in a muscle cell?

<p>Thick filament (A)</p> Signup and view all the answers

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