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- Describe how the following components relate to the placenta: umbilical arteriescotyledons, fetal vessels,chorionic villi, intervillous space, spiral arterioles, and umbilical vein?Does the hypophysis-ovaries endocrine axis work inthe same way duringpregnancy as in non-pregnantwomen? If pregnancy doesnot occur how does anothermenstrual cycle begin?Concerning the mixture ofarterial with venous bloodwhat is the differencebetween the human fetalcirculation and the adultcirculation?
- Explain how the structure of the placenta prevents mixing of fetal and maternal blood while allowing for the exchange of substances between the mother and the fetus.Describe the changes that occur during the first yearafter birth.What symptoms may appear in a newborn if its ductus arterio-sus fails to close?