Assertion :Upon stimulation of a muscle cell, calcium ions $(C a^{+ +})$ are released from the sarcoplasmic reticulum. Reason: In recating with a protein complex, $C a^{+ +}$ uncover active sites on the actin filaments.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
As the muscle cell is stimulated by an impulse, it travels the length of the sarcolemma and passes to T tubule of the sarcomere. The polarization of T tubule results in the release of Ca++ from the sarcoplasmic reticulum. These Ca++ attache to troponin-C to uncover active sites of actin filaments.
The correct reason is Polarization of T tubule results in Ca++ release.
So the correct option is B.

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