Question

After birth, air in the alveoli causes vessels in the baby's lungs to ________?

1) constrict
2) relax

Answer 1

After birth, the air in the alveoli causes the capillaries in the baby's lungs to relax.

Step-by-step explanation:

After birth, the air in the alveoli causes the capillaries in the baby's lungs to relax. When the pulmonary alveoli open, the alveolar capillaries fill with blood, and the vessels dilate. This allows for efficient exchange of gases between the blood and the alveoli.