The placenta provides the vital link between mother and fetus that develops. The blood flows of both organisms converge in it to provide fetal nutrit

Fetal circulation [Embryo]

The placenta provides the vital link between mother and fetus that develops. The blood flows of both organisms converge in it to provide fetal nutrition, but they are never mixed.

Diagram 130 shows the fetal circulation. Blood, while moving in the umbilical cord, enriches with oxygen from the mother through the placenta. It then passes through the heart, the head and the body of the fetus, giving oxygen on its way. To replenish oxygen supplies, blood returns to the heart through the placenta, almost completely bypassing the lungs. In placenta the fetal blood absorbs oxygen and leaves metabolites (e.g. CO2), which enter the maternal circulation. Placental villi increase its surface on which the gas exchange and the metabolism occur. Taken from http://worldofschool.org

Diagram 130. Circulation of the fetus: 1 — the umbilical cord; 2 — the heart; 3 — the placenta; 4 — lungs
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Questions:
  • Analyze and define the features of the fetal circulation.