Question

Blood flow to a tissue will increase if the __________
a. level of oxygen at the tissue increases.
b. level of carbon dioxide at the tissue decreases.
c. veins constrict.
d. arterioles dilate.
e. arterioles constrict.

Answer 1

Answer:

The correct answer is option 'c' arterioles dilate.

Explanation:

Since arteries are the blood vessels that carry the blood from the heart to the tissues  and since the blood is a non Newtonian fluid and the blood vessels offer resistance to the flow of blood.

When the arteries are narrow the resistance that  they offer to the flow of blood increases as a result the flood flow to tissues decreases and the blood pressure increases.

While as when the arteries dilate due to smoothing of the walls the resistance that they offer to the flow of blood decreases resulting in increase in flow of blood to tissues and this phenomenon is known as vasodilation.