What is excitation-contraction coupling? Multiple Choice A. The events that link the action potential of the sarcolemma to the activation of the myofilament contraction B. The events that link the action potential in the neuron to the diffusion of ACh across the synaptic cleft C. The events that link the calcium release from the sarcoplasmic reticulum to the change in troponin structure D. The events that link rigor formation to the hydrolysis of ATP
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The events that link the action potential of the sarcolemma to the activation of the myofilament contraction B. The events that link the action potential in the neuron to the diffusion of ACh across the synaptic cleft Show more…
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In excitation-contraction coupling, Select one: a. calcium ions must bind with myosin to expose active sites on actin. b. myosin heads bind to exposed active sites on actin. c. cross-bridges form between myosin heads and calcium ions. d. movement of the troponin-tropomyosin complex causes actin myofilaments to slide. e. ATP binds to actin myofilaments.
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How do calcium ions stimulate contraction in nonmuscle cells and smooth muscle cells? Choose one: A. Calcium ions bind to troponin and lead to a conformational change in tropomyosin that exposes the myosin binding sites on the actin filament. B. Calcium ions released into the cell promote the release of secretory vesicles that send neurotransmitters to neighboring cells to stimulate an action potential. C. Calcium ions trigger an action potential in the cell, leading to gene expression changes that influence contraction. D. Calcium ions lead to activation of a kinase that phosphorylates nonmuscle myosin to alter its conformation and enable actin binding.
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