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Question

Systemic heart refers to 


A
The heart that contracts under stimulation from nervous system
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B
Left auricle and left ventricle in higher vertebrates
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C
Entire heart in lower vertebrates
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D
The two ventricles together in humans
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Solution

The correct option is A Left auricle and left ventricle in higher vertebrates
The circulatory system of humans as other higher vertebrates is divided into two separate circuits, the systemic circuit and the pulmonary circuit. Each of these circuits consists of a similar sequence of blood vessels. Blood is pumped out of the heart into arteries of decreasing size, that merge into arterioles before reaching the sites of exchange with the capillaries. Blood leaving the capillaries is gathered into venules and then veins before returning to the heart. The systemic circuit, the left side of the heart (left auricle and left ventricle), provides the pressure to propel blood to the entire body. The pulmonary circuit, the right side of the heart, takes blood to the lungs for gas exchange with the atmosphere.
So, the correct answer is option B.

Biology

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