Question
During muscle contraction, the cross-bridge detaches when __________ .a. the myosin head binds to an ADP moleculeb. the myosin head binds to an ATP moleculec. calcium ions bind to troponind. calcium ions bind to actin
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Step 1: The question asks what causes the cross-bridges between the myosin and actin filaments to detach during muscle contraction. Show more…
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What happens when ATP binds to myosin heads during muscle contraction? A. Calcium ions are released from the sarcoplasmic reticulum. B. Calcium ions are taken up by the sarcoplasmic reticulum. C. Cross-bridges between myosin heads and actin filaments are broken. D. Myosin heads form cross-bridges with actin filaments.
What causes a muscle cell to contract? A) ATP forms a bridge binding actin to myosin. B) Calcium ions form a bridge binding actin to myosin. C) Actin and myosin break down. D) Myosin heads attached to actin bend. E) Actin heads attached to myosin bend.
\begin{equation} \begin{array}{l}{\text { During the contraction of a vertebrate skeletal muscle fiber, }} \\ {\text { calcium ions }} \\ {\text { (A) break cross-bridges as a cofactor in hydrolysis of ATP. }} \\ {\text { (B) bind with troponin, changing its shape so that the myosin- }}\end{array} \end{equation}\begin{equation} \begin{array}{l}{\text { binding sites on actin are exposed. }} \\ {\text { (C) transmit action potentials from the motor neuron to the }} \\ {\text { muscle fiber. }} \\ {\text { (D) spread action potentials through the T tubules. }}\end{array} \end{equation}
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