Multiple choice

Which of the following statements concerning the role of Ca2+ in contraction of skeletal muscles is true?

  1. The SER acts as a reserve of Ca2+ for the contractile process.

  2. Ca2+ entry across the plasma membrane is significant in maintaing the contraction of skeletal muscle in the body.

  3. A rise in intracellular Ca2+ permits actin to interact with myosin.

  4. The tension of a skeletal muscle fibre is totally governed by G proteins.
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C Correct answer
Explanation

The calcium for skeletal muscle contraction is derived from sarcoplasmic reticulum. The increase in intracellular calcium permits the interaction between actin and myosin head groups.

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