Examine the diagram of fetal circulation again. Why is the umbilical vein red? Why aren’t the pulmonary veins red like they would be in adult circulation? What is the function of the ductus venosus?

What is primary oocytes and secondary oocytes?

An atrial septal defect is a birth defect in which there is an opening in the septum between the left and right atria. People with such a defect typically have more than a normal amount of blood in the right atrium. Why does blood flow from left to right across the septum rather than in the opposite direction? The excess of blood can cause hypertension in one circuit. Which one?

Concerning the mixture ofarterial with venous bloodwhat is the differencebetween the human fetalcirculation and the adultcirculation?