The depletion of ATP in muscle cells causes ____. myosin heads to remain bound to actin calcium ions to be released from the sarcoplasmic reticulum myosin-binding sites on actin to be blocked again by tropomyosin. ligand-gated sodium channels to close again
Added by Bego-A L.
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This means that the myosin heads remain bound to actin, preventing muscle relaxation. The other options are not directly related to ATP depletion in muscle cells. Show more…
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During muscle contraction, the opening of voltage-gated Ca2+ channels in T tubules and Ca2+-release channels in the sarcoplasmic reticulum leads to the displacement of tropomyosin from actin so that myosin heads can bind to the filaments.
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myosin quickly breaks phosphate bond of ATP free phosphate group released from the ATP binding site of myosin ADP released from the ATP binding site of myosin new ATP molecule binds to open ATP binding site of myosin very low calcium in sarcoplasm, actin and myosin unbound, troponin and tropomyosin in place myosin heads weakly bind actin myosin becomes re-energized and bound with ADP+P, ready to contract again and repeat the cycle
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