In skeletal muscle what initial event is required to allow myosin cross bridges to bind to actin A) atp binding to tropomyosin B) calcium ions binding to troponin C) ADP Binding to actin D) active transport of calcium ions into the sarcoplasmic reticulum E) closing is the ryanodine calcium channels in the membrane of the sarcoplasmic reticulum
Added by Ruben H.
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Step 1: When a motor neuron stimulates the muscle fiber, an action potential is generated and travels down the T-tubules. Show more…
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\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}
During muscle contraction, the cross-bridge detaches when __________ . a. the myosin head binds to an ADP molecule b. the myosin head binds to an ATP molecule c. calcium ions bind to troponin d. calcium ions bind to actin
During the contraction of a vertebrate skeletal muscle fiber, calcium ions a. break cross-bridges by acting as a cofactor in the hydrolysis of ATP. b. spread action potentials through the T tubules. c. re-establish the polarization of the plasma membrane following an action potential. d. transmit action potentials from the motor neuron to the muscle fiber. e. bind with troponin, changing its shape so that the myosin-binding sites on actin are exposed.
Marlyn J.
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