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Upon stimulation of skeletal muscles calcium is immediately made available

Upon stimulation of skeletal muscles calcium is immediately made available for binding to troponin from

Options

(a) blood
(b) lymph
(c) sarcoplasmic reticulum
(d) bone

Correct Answer:

sarcoplasmic reticulum

Explanation:

The sarcoplasmic reticulum is a specialized type of smooth ER that regulates the calcium ion concentration in the cytoplasm of striated muscle cells. A system of membrane-bound tubules that surrounds muscle fibrils, releasing calcium ions during contraction and absorbing them during relaxation. The endoplasmic reticulum found in striated muscle fibers.

AMU2009
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