Binding of calcium ions to troponin c j uptake of atp

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Unformatted text preview: eased into the synaptic cleft by exocytosis. Acetylcholine binds to post-synaptic receptors on the sarcolemma. Na+ moves across the sarcolemma into the muscle cell. Opening of the chemically-gated sodium channels. Opening of the voltage-gated sodium channels. Opening of potassium channels. Binding of calcium ions to Troponin C. Uptake of ATP by the myosin heads. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. Value 100% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0% 0.67/0.67 4. As a result of threshold depolarization at the neuromuscular junction, what happens on the adjacent sarcolemma? Student Response Calcium ions enter the axon Calcium ions enter the sarcoplasm from the sarcoplasmic reticulum. Acetylcholine is released into the synaptic cleft by exocytosis. Acetylcholine binds to post-synaptic receptors on the sarcolemma. Na+ moves across the sarcolemma into the muscle cell. Opening of the chemically-gated sodium channels. G. Opening of the voltage-gated sodium channels. Value 0% 0% 0% 0% 0% 0% 100% H. I. J. K. 0% 0% 0% A. B. C. D. E. F. Score: Opening of potassium channels. Binding of calcium ions to Troponin C. Uptake of ATP by the myosin heads. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. 0% 0.67/0.67 5. As soon as Ca++ ions enter the axon: Student Response A. Calcium ions enter the axon B. Calcium ions are pumped back into the sarcoplasmic reticulum. C. Acetylcholine is released into the synaptic cleft by exocytosis. Value 0% 0% 100% D. E. F. G. H. I. J. K. 0% 0% 0% 0% 0% 0% 0% Acetylcholine binds to post-synaptic receptors on the sarcolemma. Na+ moves across the sarcolemma into the muscle cell. Opening of the chemically-gated sodium channels. Opening of the voltage-gated sodium channels. Opening of potassium channels. Binding of calcium ions to Troponin C. Uptake of ATP by the myosin heads. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. 0% Score: 0.67/0.67 6. What event causes opening of the chemically-gated Na+ channels? Student Response A. Calcium ions enter the axon B. Calcium ions are pumped back into the sarcoplasmic reticulum. C. Acetylcholine is released into the synaptic cleft by exocytosis. D. Acetylcholine binds to post-synaptic receptors on the sarcolemma. Value 0% 0% 0% 100% E. F. G. H. I. J. K. 0% 0% 0% 0% 0% 0% Score: Na+ moves across the sarcolemma into the muscle cell. Breakdown of ACh by AChase. Opening of the voltage-gated sodium channels. Opening of potassium channels. Binding of calcium ions to Troponin C. Uptake of ATP by the myosin heads. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. 0% 0.67/0.67 7. As a direct result of Ca+2 binding to troponin: Student Response Calcium ions enter the axon Calcium ions are pumped back into the sarcoplasmic reticulum. Acetylcholine is released into the synaptic cleft by exocytosis. Acetylcholine binds to post-synaptic receptors on the sarcolemma. Na+ moves across the sarcolemma into the mus...
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This note was uploaded on 01/29/2013 for the course BIOL 239 taught by Professor Swan during the Fall '12 term at New Mexico.

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