Which of the following groups represent correctly the substances that the capillaries exchange between blood and tissues?
(a) oxygen, carbon dioxide, RBC, food
(b) oxygen, carbon dioxide, food, waste products
(c) water, plasma, WBC, RBC
(d)oxygen, carbon dioxide, WBC, RBC

Correct Answer: (b) oxygen, carbon dioxide, food, waste products

Explanation:

Blood Capillaries are minute thin-walled vessels that connect the arterioles and venules; it is through the surface of the capillaries that nutrients and wastes are exchanged between the blood and body tissues.