Question

Which of the following factors has little effect on blood flow in arteries?

• A. Heart beat
• B. Blood pressure
• C. Skeletal muscle contraction
• D. Total cross sectional area of vessel

Answer 1

The correct option is D Total cross sectional area of vessel

The increase in the heart beat leads to increase in the volume of blood pumped in the arteries which lead to the better supply of blood to the muscles.

Blood pressure is an amount of force exerted against the walls of the arteries as blood flows through them. The increased blood pressure increases the amount of blood flow in the arteries.

The contraction of skeletal muscles increase the blood flow as the metabolic rate increases and ATP is utilized.

Total cross-sectional area indirectly affects the blood flow as the blood flow increase only in case of vasodilation which is caused only due to the relaxation of smooth muscles.

So, the correct answer is option D.