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Q: The blood vessels that carry the oxygen-poor blood back to the heart is known as:
  • A. arteries
  • B. nodes
  • C. lymph vessels
  • D. veins
Correct Answer: Option D - Human circulatory system has mainly three parts viz- Heart, Artery and Veins. Veins are the blood capillaries that carry deoxygenated blood from different parts of the body to the heart whereas Arteries are oxygen rich blood carrying capillaries which carry blood away from the heart to the different parts of the body. The normal blood pressure of human body is 120/80 mmHg.
D. Human circulatory system has mainly three parts viz- Heart, Artery and Veins. Veins are the blood capillaries that carry deoxygenated blood from different parts of the body to the heart whereas Arteries are oxygen rich blood carrying capillaries which carry blood away from the heart to the different parts of the body. The normal blood pressure of human body is 120/80 mmHg.

Explanations:

Human circulatory system has mainly three parts viz- Heart, Artery and Veins. Veins are the blood capillaries that carry deoxygenated blood from different parts of the body to the heart whereas Arteries are oxygen rich blood carrying capillaries which carry blood away from the heart to the different parts of the body. The normal blood pressure of human body is 120/80 mmHg.