anonymous
  • anonymous
From the 2000 IBO theory paper A: 98. A nerve-skeletal muscle isolated preparation is placed in a Ca2+ -free medium appropiate for its survival. If the nerve is electrically stimulated, which of the following events will occur? ___A) The muscle will not be stimulated ___B) The muscle will be stimulated but will not contract ___C) The muscle will be both stimulated and contract ___D) The muscle will not be stimulated, but even if it is, it will not contract ___E) The muscle may be stimulated, and may contract but it will not relax
Biology
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anonymous
  • anonymous
From the 2000 IBO theory paper A: 98. A nerve-skeletal muscle isolated preparation is placed in a Ca2+ -free medium appropiate for its survival. If the nerve is electrically stimulated, which of the following events will occur? ___A) The muscle will not be stimulated ___B) The muscle will be stimulated but will not contract ___C) The muscle will be both stimulated and contract ___D) The muscle will not be stimulated, but even if it is, it will not contract ___E) The muscle may be stimulated, and may contract but it will not relax
Biology
jamiebookeater
  • jamiebookeater
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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anonymous
  • anonymous
I thought it was C because muscle cells store calcium in the sacromerial reticulum but the answer sheet said A.
caozeyuan
  • caozeyuan
Ca2+ in the SR may be released only when it is stimulated by Ca2+ influx from the outside. However, there is no Ca2+ outside, hence SR will not release its Ca2+ so muscle cannot contract. Stimulation does not occur because there is no outside Ca2+
anonymous
  • anonymous
ooh thank you soo much!!! I was stuck with this question for so long

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