Source of $C a^{2 +}$ for muscle contraction is both sarcoplasmic (endoplasmic) reticulum as well as extracellular fluid in case of

a. Skeletal muscles
b. Smooth muscles
c. Cardiac muscles

a only

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b and c only

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a and c only

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b only

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Solution

The correct option is D b and c only
Cardiac muscle and smooth muscle derives its calcium from both the extracellular fluid and intracellular stores (SR), and skeletal muscle, which is only activated by calcium stored in the sarcoplasmic reticulum(SR).

So, the correct option is b and c only.

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