Question

In which of the following blood vessels in humans, blood have the lowest velocity

• A. Veins
• B. Arteries
• C. Aorta
• D. Capillaries

Answer 1

The correct option is D

Capillaries

The correct option is (D):

Explanation of the correct option:

1. Capillaries are the fine networks that help in connecting the arteries to the veins.
2. They are very thin and tubular and blood flows with the minimum velocity inside the capillaries.
3. Thus, low velocity provides enough time for the exchange of gases (oxygen and carbon dioxide), nutrients, and waste products.

Explanation of the incorrect options:

Option (A):

1. Veins are the blood vessels that carry deoxygenated blood towards the right atrium of the heart from different parts of the body.
2. The blood flow inside the veins is faster in comparison to capillaries.

Option (B):

1. Arteries are the blood vessels that carry oxygenated blood away from the heart and transport it to the targeted tissues and organs.
2. The walls of the arteries are thick as the blood flow inside the arteries is very rapid.

Option (C):

1. Aorta is the largest artery having the thickest walls.
2. The velocity of blood inside the aorta is maximum.

Final answer:

In the capillaries of humans, blood has the lowest velocity.