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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Definitions:

Abraham Lincoln

16th President of the United States, led the country during the Civil War and emancipated the slaves.

Jefferson Davis

The President of the Confederate States of America during the American Civil War.

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