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Q.

Given below are two statements. One is labelled Assertion (A) and the other is labelled Reason (R).

Assertion (A): The human heart is myogenic.

Reason  (R): A coronary system of blood vessels is present in our body for the circulation of blood to and from the cardiac musculature.

In light of the above statements, choose the correct answer from the options given below.

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a

Both (A) and (R) are true and (R) is the correct explanation of (A).

b

Both (A) and (R) are true but (R) is not the correct explanation of (A).

c

(A) is true but (R) is false.

d

Both (A) and (R) are false.

answer is B.

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Detailed Solution

Both (A) and (R) are true but (R) is not the correct explanation of (A).

Assertion (A) states that the human heart is myogenic. This is true. The human heart is myogenic, meaning it can generate its own rhythm without the need for external stimulation from nerves.

Reason (R) states that a coronary system of blood vessels is present in our body for the circulation of blood to and from the cardiac musculature. This is also true. The coronary circulation supplies oxygenated blood to the heart muscle itself, ensuring that the heart receives the necessary nutrients and oxygen for its function.

However, the presence of a coronary system of blood vessels does not directly relate to the myogenic nature of the heart. The myogenic nature of the heart refers to its ability to generate its own electrical impulses to initiate contraction, rather than relying on external nerve stimulation. Therefore, while both statements are individually true, Reason (R) does not provide a correct explanation for Assertion (A).

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