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Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z...

Question:

Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move clo
Which of the following statements about skeletal muscle contraction is false? During muscle contraction, the Z discs move closer together as the myosin heads move toward the plus ends of the actin filaments. The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction. An action potential in the muscle cell plasma membrane leads to voltage-gated calcium channels opening in the T-tubule membrane. Calcium activates troponin which in turn moves tropomyosin so that it no longer blocks the binding of myosin heads to the actin filament.

Answers

Ans b. The changes in voltage across the plasma membrane that occuar when a muscle cell receives a signal from the nervous system causes Ca2+ to flow into the sarcoplasmic reticulum, triggering a muscle contraction.

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