Answer:
b
Explanation:
Before birth, oxygenated blood comes from Placenta and goes to fetus heart through "ductus venosus" by bypasses liver. At birth, blood circulation change due to pulmonary and systemic vasuclar resistance when placenta is disconnected. Systemic resistance rises when blood flow loss through placenta. As systemic resistance rises, aortic pressure increases and in this case lungs are also expand. As lungs expand, the pulmonary vascular resistance greatly falls.
Answer:
B
Explanation:
At birth, system resistance increase while pulmonary resistance decrease
