Question

Capillaries exchange the following between blood and tissues:
(a) oxygen, carbon dioxide, nitrogen, plasma
(b) oxygen, carbon dioxide, food, wastes
(c) water, plasma, WBC, RBC
(d) oxygen, carbon dioxide, WBC, RBC

Answer 1

(b) oxygen, carbon dioxide, food, wastes

The walls of capillaries are very thin. Gases, digested food, hormones and waste products of the body easily pass through the capillaries and get exchanged in the blood.