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What happens to the actin and myosin during a muscle contraction?

•The actin filaments push against the myosin filaments, making the myosin filaments smaller

•The actin filaments are forced inward by the flexing of the muscle

•The myosin filaments remain in place as they pull the actin filaments inward

•The myosin filaments compress the actin filaments, making the actin filaments smaller

Answer :

Beckybrownsgo

Explanation:

Once the myosin-binding sites are exposed, and if sufficient ATP is present, myosin binds to actin to begin cross-bridge cycling. Then the sarcomere shortens and the muscle contracts. In the absence of calcium, this binding does not occur, so the presence of free calcium is an important regulator of muscle contraction.

Answer:

C, The myosin filaments remain in lace as they pull the actin filaments inward

Explanation:

Muscles contract when the heads on the myosin filaments latch onto the actin filaments, drawing them inward. As a result, the entire sarcomere shortens, resulting in a muscle contraction.

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