Muscle Cell Contraction
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Questions and Answers

What is the main component of the thick filaments in a sarcomere?

  • Myofiber
  • Sarcomere
  • Myosin II (correct)
  • Actin

    • How much do sarcomeres shorten to during muscle contraction compared to their resting length?

  • 30%
  • 50%
  • 70% (correct)
  • 80%

    • What is the primary characteristic of paracrine signaling?

  • Messenger molecules travel long distances through the body
  • Messenger molecules are highly stable and do not get degraded
  • Paracrine signaling occurs between nerve cells and muscle cells
  • Messenger molecules act on cells in close proximity to the source (correct)

    • Why are paracrine messenger molecules typically limited in their ability to travel around the body?

    <p>They are inherently unstable or get degraded by enzymes</p> Signup and view all the answers

    Which of the following is an example of paracrine signaling?

    <p>Neurotransmitter release at the neuromuscular junction</p> Signup and view all the answers

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