Question

Which one of the following statements is correct about the human circulatory system?
(a) Blood transports only oxygen and not carbon dioxide.
(b) Human heart has five chambers.
(c) Valves ensure that the blood does not flow backwards.
(d) Both oxygen-rich and oxygen-deficient blood gets mixed in the heart.

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Answer 1

C) Valves ensure that the blood does not flow backward is the Right Answer.

Explanation:

In the human circulatory system, the human heart consists of four chambers. Both oxygen-rich and oxygen-deficient blood does not get mixed in the heart. Blood transports both oxygen and carbon dioxide across the body.

Valves are flaps of fibrous tissues located in the cardiac chambers between the veins. They ensure that the blood flows in a single direction (unidirectional). Flaps also prevent the blood from flowing backwards. Based on their function, valves are of two types:

1) Atrioventricular valves

Atrioventricular valves are between ventricles and atria. The valve between the right ventricle and right atrium is the tricuspid valve, and the one which is found between the left ventricle and left atrium is known as the mitral valve.

2) Semilunar valves

Semilunar valves are located between the left ventricle and aorta. It is also found between the pulmonary artery and right ventricle.

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Answer 2

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c) Valves ensure that the blood does not flow backwards.

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