Which of the Following Statements About Skeletal Muscle Contraction Is

question 31

Multiple Choice

Which of the following statements about skeletal muscle contraction is FALSE?

• A)When a muscle cell receives a signal from the nervous system, voltage-gated channels open in the T-tubule membrane.
• B)The changes in voltage across the plasma membrane that occur when a muscle cell receives a signal from the nervous system cause an influx of Ca²⁺ into the sarcoplasmic reticulum, triggering a muscle contraction.
• C)A change in the conformation of troponin leads to changes in tropomyosin such that it no longer blocks the binding of myosin heads to the actin filament.
• D)During muscle contraction, the Z discs move closer together as the myosin heads walk toward the plus ends of the actin filaments.

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