Muscle Contraction Is Triggered

question 52

Multiple Choice

Muscle contraction is triggered

• A)when high levels of oxygen and sugar are released by the sarcolemma.
• B)when a surplus of ATP is released by a nerve motor unit.
• C)by release of a neurotransmitter at a synapse that directly causes actin and myosin to slide.
• D)by the nerve releasing a neurotransmitter,which triggers a flow of calcium that attaches to actin filaments and exposes the myosin binding sites.
• E)by the nerve releasing a neurotransmitter,which triggers a flow of calcium that releases ATP and begins the actin filaments sliding across the myosin binding sites.

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