What initiates muscular contraction?
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The second is the actual shortening of sarcomeres, which requires both the presence of Calcium and ATP. Thecontraction of skeletal muscle cells is under voluntary control by the nervous system. ... These steps initiate muscle contraction. Calcium released from the SR binds to a protein called tropomyosin.
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The contraction of skeletal musclecells is under voluntary control by the nervous system. ... These stepsinitiate muscle contraction. Calcium released from the SR binds to a protein called tropomyosin. This protein normally blocks sites on actin that bind myosin heads during contraction.
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