Assertion :Atria act as primer pumps that increase the ventricular pumping. Reason: About 80 percent of the blood flows directly through the atria into ventricles.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Approximately 80% of the blood flows directly through the atria into the ventricles. Atria act as primer pumps that increase the ventricular pumping. Their contraction increases the ventricular pumping by as much as 20%.
Thus, the correct answer is option A.

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