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ACSM Personal Trainer

Category - Initial Client Consultation and Assessment

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The sliding filament theory is the proposed method by which muscle contraction occurs after neural activation. During this process, what occurs within the muscle fiber after the myosin heads attach to the actin filament?

Actin filament is pulled across the myosin
Chemical messengers transfer the electrical impulse to the muscle
Neurotransmitters attach at receptor sites
Action potentials transmit impulses

Explanation

Answer: A - After the myosin heads attach to the actin filament, the actin is pulled across the myosin, which shortens the fiber length (Z lines converging) and causes muscle contraction.

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