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.

Answer 1

The correct option is C

Valves ensure that the blood does not flow backwards.

The correct option is C.

Explanation of correct option:

1. Valves are actual flaps located on each end of two ventricles.
2. It prevents the backward flow of blood.

Explanation of incorrect options:

Option A:

Blood transports both oxygen and carbon dioxide.

Option B:

The human heart has four chambers- aortic valve, mitral valve, pulmonary valve, and tricuspid valve.

Option D:

Both oxygen-rich and oxygen-deficient blood gets separated in the heart by the septum.

Final answer: ‘Valves ensure that the blood does not flow backwards’ is the correct statement about the human circulatory system.