Skeletal and Smooth Muscle Contraction
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Questions and Answers

What is the function of the sarcoplasmic reticulum in muscle contraction?

  • Synthesizing actin and myosin filaments
  • Generating energy for muscle movement
  • Transporting ions for muscle relaxation
  • Releasing calcium ions for muscle contraction (correct)

What is the name of the cell membrane of a muscle fiber?

  • Sarcoplasm
  • Myofibril
  • Sarcomere
  • Sarcolemma (correct)

What are the small projections from the sides of the myosin called?

  • Z discs
  • Cross-bridges (correct)
  • Actin filaments
  • Sarcomeres

What gives myofibrils their striated appearance?

<p>Interdigitation of myosin and actin filaments (D)</p> Signup and view all the answers

What is the portion of the myofibril that lies between two successive Z discs called?

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

What is the main source of energy required for the walk-along mechanism during muscle contraction?

<p>The concentration of ATP in the muscle fiber (A)</p> Signup and view all the answers

What happens to the actin filaments during muscle contraction?

<p>They pull inward among the myosin filaments to their maximum extent (D)</p> Signup and view all the answers

What role does acetylcholine play in muscle excitation?

<p>It binds to the Ach-gated channels and opens the channel (C)</p> Signup and view all the answers

How long can the concentration of ATP in the muscle fiber maintain full contraction?

<p>1 to 2 seconds (A)</p> Signup and view all the answers

What is the function of transverse tubules (T-tubules) during excitation-contraction coupling?

<p>Transmission of action potential to deeper regions of the muscle fiber (D)</p> Signup and view all the answers

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