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Discussion Starter #1
To which of the following labeled area does Calcium entry promote the release of intracellular Calcium?

emfiberslabeled.JPG
 

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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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Discussion Starter #5
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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