The pulmonary venous circulation does which of the following? 1. Delivers oxygenated blood back to the heart. 2. Delivers deoxygenated blood to the lungs. 3. Empties into the left atrium. 4. Empties into the right atrium
a. 2 and 3 only
b. 1 and 4 only
c. 2 and 4 only
d. 1 and 3 only
ANS: D
The pulmonary venous system drains the capillary beds that have received O2 from the alveoli and delivers the oxygenated blood into the left atrium.
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