Questions: A muscle fiber cannot contract until Calcium rushes in to remove the blocking molecules and make the active site available to be engaged. ATP myosin sarcomeres

A muscle fiber cannot contract until Calcium rushes in to remove the blocking molecules and make the active site available to be engaged. ATP myosin sarcomeres
Transcript text: 5 Multiple Choice 2 points A muscle fiber cannot contract until $\qquad$ Calcium rushes in to remove the blocking molecules and make the active site available to be engaged. ATP myosin sarcomeres
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Solution

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The answer is the first one: Calcium rushes in to remove the blocking molecules and make the active site available to be engaged.

Explanation for each option:

  • Calcium rushes in to remove the blocking molecules and make the active site available to be engaged: This is correct. Muscle contraction is initiated when calcium ions bind to troponin, causing a conformational change that moves tropomyosin away from the active sites on actin filaments, allowing myosin heads to bind to actin and initiate contraction.
  • ATP: While ATP is essential for muscle contraction, it is not the initial trigger. ATP is required for the myosin heads to detach from actin and re-cock for another cycle of contraction.
  • Myosin: Myosin is a motor protein that interacts with actin to produce muscle contraction, but it cannot bind to actin until the active sites are exposed by the action of calcium.
  • Sarcomeres: Sarcomeres are the structural units of muscle fibers, but they do not initiate contraction. The contraction process begins with the binding of calcium to troponin.

Summary: A muscle fiber cannot contract until calcium rushes in to remove the blocking molecules and make the active site available to be engaged.

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