A) If both the assertion and the reason are true and the reason is a correct explanation of the assertion
B) If both the assertion and reason are true but the reason is not a correct explanation of the assertion
C) If the assertion is true but the reason is false
D) If both the assertion and reason are false
E) If the assertion is false but reason is true
Correct Answer: B
Solution :
The completely four chambered mammalian heart actually comprises two separate pump working in unison. The right side of the heart serves as one pump. It contains only venous blood received from the body and sent to the lungs through pulmonary circulation. The left side of the heart serves as the second pump. It left side of the heart serves as the second pump. It contains only oxygenated blood received from the lungs and sent to the body through systemic circulation. Thus there is no mixing of venous and oxygenated blood in the heart, and the blood passes through the heart twice, once along the pulmonary circuit and second time in the systemic circuit. This is known as the double circulation.
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