First Subject: Circulatory System
Description
Which of the following blood vessels allows gas and solute exchange between blood and tissues?
a. capillaries
b. pulmonary arteries
c. pulmonary veins
d. veins
- Capillary vessel walls are 1 cell layer thick to allow diffusion of oxygen and nutrients from the blood to the tissues and carbon dioxide and waste products from the tissues into the bloodstream. Capillaries are the only blood vessels that allow this exchange with the tissues.
