Assertion :There is no mixing of oxygenated and deoxygenated blood in the human heart. Reason: Valves are present in the heart which allows the movement of blood in one direction only.

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
There is no mixing of oxygenated and deoxygenated blood in the human heart. This results in a very efficient circulatory system. Also, valves are present in the heart which allows the movement of blood in one direction only but the presence of valves in the heart does not have any role in the prevention of mixing of deoxygenated and oxygenated blood.
Thus, the correct answer is 'Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.'

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