Question

The rate of blood flow in the capillaries is very low because capillaries are

(a) very narrow and have high resistance

(b) much wide and have low resistance

(c) very narrow and have low resistance

(d) much wide and have high resistance​

Answer 1

Answer:

c) very narrow and have low resistance

Explanation:

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Answer 2

The rate of blood flow in the capillaries is very low because capillaries are (a) very narrow and have high resistance.

Explanation:

• When the heart pumps, the blood starts circulate from the aorta to the arteries, arterioles, and capillaries to supply the blood all over the body.
• Blood flow is slow in the capillaries compared to other vessels, because it allows great time to supply nutrients and oxygen to all parts of the body.
• The velocity of blood flow is inversely proportioned to the total cross-sectional area of blood vessels.
• As the total cross-sectional area of the blood vessel increases, the velocity of blood flow decreases.
• Resistance is nothing but, which oppose the flow of blood.
• As diameter of capillary narrow (decreases),  the resistance increases and the blood flow decreases (slow).