Muscle Physiology and Sarcoplasmic Reticulum
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Questions and Answers

What role does the sarcoplasmic reticulum play in muscle function?

  • It produces ATP for muscle contractions.
  • It ensures muscle excitation-contraction coupling. (correct)
  • It breaks down lactic acid during exercise.
  • It generates action potentials.

    • How many Ca2+ molecules are moved into the sarcoplasmic reticulum for each ATP molecule hydrolyzed?

  • Three
  • Two (correct)
  • One
  • Four

    • What is the function of the Ca2+ binding protein, calsequestrin?

  • To release calcium ions into the cytoplasm.
  • To transport calcium ions to the mitochondria.
  • To deactivate voltage-gated calcium channels.
  • To help store calcium at high concentration in the terminal cisternae. (correct)

    • What initiates the release of calcium from the sarcoplasmic reticulum during muscle contraction?

    <p>A conformational change in the ryanodine receptor.</p> Signup and view all the answers

    What happens to muscle contraction when cytoplasmic calcium concentration declines?

    <p>Muscle contraction stops, causing relaxation.</p> Signup and view all the answers

    Where are calcium ions stored within the sarcoplasmic reticulum?

    <p>In the terminal cisternae.</p> Signup and view all the answers

    What action takes place in the T-tubules during muscle contraction?

    <p>Voltage-gated Ca2+ channels open.</p> Signup and view all the answers

    What mechanism allows calcium ions to move into the longitudinal part of the sarcoplasmic reticulum?

    <p>Ca2+-Mg2+ ATPase pumps.</p> Signup and view all the answers

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