A) form of rough endoplasmic reticulum
B) site of glycogen storage and degradation to glucose
C) site into which calcium is released during muscle relaxation
D) site of a calcium-binding protein and a calcium-activated ATPase ,
Correct Answer: D
Solution :
The sarcoplasmic reticulum is a modified smooth endoplasmic reticulum. That serves alternatively as a storage site and a source of cellular calcium.
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