| pulmonary artery | a) branches of pulmonary arteries; structurally like veins and venules, with thin walls and large lumens |
| pulmonary arterioles | b) two from each lung carry blood into the left atrium |
| pulmonary capillaries | c) area of exchange for oxygen and carbon dioxide |
| pulmonary venules | d) first vessel leaving the pulmonary side of the heart to carry blood to the lungs; |
| pulmonary veins | e) smallest veins; collect blood from capillaries as it flows back toward heart |