Attachment of actin myosin crossbridges and swiveling

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Unformatted text preview: of the chemically-gated sodium channels. Opening of the voltage-gated sodium channels. Opening of potassium channels. I. Binding of calcium ions to Troponin C. J. Uptake of ATP by the myosin heads. K. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. A. B. C. D. E. F. G. H. Value 0% 0% 0% 0% 0% 0% 0% 0% 100% 0% 0% Score: 0.66/0.66 12. Curare acts as a muscle relaxant by competing with this process: 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 binding 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. The troponin-tropomyosin complex shifts, exposing the active sites on actin. Uptake of ATP by the myosin heads. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. 0% 0.66/0.66 13. An action potential is generated on the sarcolemma by which event of the following: 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 out of the muscle cell. Opening of the chemically-gated sodium channels. G. Opening of the voltage-gated sodium channels. H. Opening of potassium channels. I. Binding of calcium ions to Troponin C. J. Uptake of ATP by the myosin heads. K. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. A. B. C. D. E. F. Score: Value 0% 0% 0% 0% 0% 0% 100% 0% 0% 0% 0% 0.66/0.66 14. What event causes depolarization of the sarcolemma at the neuromuscular junction? 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 out of the muscle cell. F. Opening of the chemically-gated sodium channels. G. Opening of the voltage-gated sodium channels. H. Opening of potassium channels. I. Binding of calcium ions to Troponin C. J. Uptake of ATP by the myosin heads. K. Attachment of actin-myosin crossbridges and swiveling of the myosin heads. A. B. C. D. E. Value 0% 0% 0% 0% 0% 100% 0% 0% 0% 0% 0% Score: 0.66/0.66 15. Which of the following binds calcium ions: Student Response A. B. C. D. sarcoplasmic reticulum troponin C myosin all of the above E. 1 and 2, but not 3 Value 50% 50% 0% 0% 100% 0.66/0.66 Score: View Attempt 2 of 3 Title: Started: Submitted: Time spent: Quiz #5 - Stimulus-Contraction Coupling October 13, 2008 11:31 AM October 13, 2008 11:41 AM 00:09:23 Total score: 10/10 = 100% Total score adjusted by 0.0 Maximum possible score: 10 1. What event causes r...
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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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