PATHOLOGY

Detailed explanation-1: -Arterioles connect with even smaller blood vessels called capillaries. Through the thin walls of the capillaries, oxygen and nutrients pass from blood into tissues, and waste products pass from tissues into blood. From the capillaries, blood passes into venules, then into veins to return to the heart.

Detailed explanation-2: -As blood moves through the capillaries, the oxygen and other nutrients move out into the cells. Then waste matter from the cells goes into the capillaries. As the blood leaves the capillaries, it moves through the veins. Veins merge into larger tubes to carry the blood back to the heart.

Detailed explanation-3: -The walls of capillaries are very thin-so thin that nutrients and oxygen can pass right through them. As red blood cells pass through the capillaries, they drop off the oxygen that your cells need to live, and pick up the waste gas, carbon dioxide. Capillary (cap-ill-air-e) walls are only a single cell thick.