1. The two upper chambers of the heart are called the: a. Ventricles c. Aorta b. Atria d. Vena cava 3. What happens to the blood as it passes through the pulmonary capillaries? a. Oxygen is added and...

1. The two upper chambers of the heart are called the:

a. Ventricles c. Aorta

b. Atria d. Vena cava

3. What happens to the blood as it passes through the pulmonary capillaries?

a. Oxygen is added and carbon dioxide removed.

b. Carbon dioxide is added and oxygen is removed.

c. Oxygen is added and carbon dioxide is added.

d. Oxygen is removed and carbon dioxide is removed.