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Old 12-16-2009
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Microscope Actin Myosin EM Image Question

To which of the following labeled area does Calcium entry promote the release of intracellular Calcium?

Actin Myosin EM Image Question-emfiberslabeled.jpg
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Old 12-16-2009
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I choose A
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Old 12-16-2009
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I choose B, which is the junction of A and I bands which is the site of T tubules which are the site of Calcium entry.
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Old 12-17-2009
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I also pick B
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Old 12-17-2009
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Default The correct answer

The correct option is A
T tubules are inserted at Z lines in cardiac muscles and at junction of the A and I band in skeletal muscles.
Since the question is talking about a Calcium dependent Calcium release then it must be the cardiac myocyte.
A is pointing to Z line.
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The above post was thanked by:
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Histology-, Micrographs-, Physiology-, Step-1-Questions

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