Question

Which of the following is NOT a part of the human circulatory system?

• A. Heart
• B. Arteries
• C. Lungs
• D. Veins

Hint:

The circulatory system is responsible for transporting blood, oxygen, and nutrients, while the respiratory system facilitates gas exchange.

Answer 1

The Correct Option is C

The human circulatory system includes the heart, arteries, veins, and capillaries, which work together to transport blood and nutrients throughout the body.
- Option (1) is incorrect: The heart is the central organ of the circulatory system.
- Option (2) is incorrect: Arteries carry oxygenated blood away from the heart.
- Option (3) is correct: The lungs are part of the respiratory system, not the circulatory system. They help oxygenate the blood but are not directly involved in the circulation of blood.
- Option (4) is incorrect: Veins carry deoxygenated blood back to the heart.
Thus, the lungs are NOT part of the circulatory system.