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Assertion : Stimulation of renin secretion will increase the volume of extracellular fluid (ECF).
Reason : Increased ECF occurs due to decreased active reabsorption of $\mathrm{Na}^{+}$.
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Reason : Increased ECF occurs due to decreased active reabsorption of $\mathrm{Na}^{+}$.
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If assertion is true but reason is false.
When ECF secretion decreases, renin release is stimulated which reduces $\mathrm{Na}^{+}$ excretion, which in turn increases volume of ECF. When sodium intake exceeds sodium output by the kidneys, total body sodium and extracellular fluid volume increases.
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