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Question

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

A
Blood
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B
Lymph
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C
Sacroplasmic reticulum
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D
Bone
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Solution

The correct option is A Sacroplasmic reticulum
Answer is option C i.e. "Sacroplasmic reticulum"
Neurotransmitter acetylcholine generates an action potential in the sarcolemma causing the release of calcium ions into the sarcoplasm from the sarcoplasmic reticulum.
When Ca++ level increases it leads to the binding of calcium with a sub-unit of troponin on actin(thin) filaments and thereby activating the movement.

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