NEET BIOLOGY

Detailed explanation-1: -Oxygen and nutrients from the mother’s blood are transferred across the placenta to the fetus through the umbilical cord. This enriched blood flows through the umbilical vein toward the baby’s liver. There it moves through a shunt called the ductus venosus. This allows some of the blood to go to the liver.

Detailed explanation-2: -Through the blood vessels in the umbilical cord, the fetus receives all the necessary nutrition, oxygen, and life support from the mother through the placenta. Waste products and carbon dioxide from the fetus are sent back through the umbilical cord and placenta to the mother’s circulation to be eliminated.

Detailed explanation-3: -Nutrient and drug transfer across the placenta are by passive diffusion, facilitated diffusion, active transport, and pinocytosis. Placental drug transfer is dependent on the physical properties of the placental membrane and on the pharmacological properties of the drug.

Detailed explanation-4: -As shown in Figure 2.2, maternal blood enters the placenta through the basal plate endometrial arteries (spiral arteries), perfuses intervillous spaces, and flows around the villi where exchange of oxygen and nutrients occurs with fetal blood.