Question

investigate: take samples of blood from all over the body. try to determine where sugar enters the blood, and where it is removed. where does sugar enter the blood? capillaries veins arteries arterioles

Explanation:

Capillaries are the site where nutrients, including sugar (glucose), are exchanged between the blood and the surrounding tissues. They have thin walls that allow for easy diffusion of substances.

Answer:

A. Capillaries