The pulmonary arterial circulation does which of the following? 1. Delivers oxygenated blood back to the heart. 2. Delivers deoxygenated blood to the lungs. 3. Originates on the left side of the heart. 4. Originates on the right side of the heart

a. 1 and 4 only
b. 2 and 4 only
c. 1 and 3 only
d. 2 and 3 only

ANS: B
The pulmonary circulation arises from the right heart (Figure 9-30) and carries the entire cardiac output through the lung each minute. O2-reduced systemic venous blood returns to the right heart via the inferior and superior venae cavae. This blood is pumped to the lungs by the right ventricle through the pulmonic semilunar valve and on to the trunk of the pulmonary artery.