Question

question 23
after 14 - 16 weeks, which structure provides nutrition to the embryo and has excretion, respiration, and endocrine functions?
placenta
amnion
chorion
chorionic villi

Explanation:

The placenta is an organ that develops during pregnancy. It attaches to the wall of the uterus and the umbilical cord connects it to the fetus. The placenta provides nutrition to the embryo (later fetus), allows for the excretion of waste products (by facilitating the transfer of waste from the fetal blood to the maternal blood for elimination), is involved in gas exchange (respiration - oxygen from mother to fetus and carbon dioxide from fetus to mother), and also has endocrine functions (produces hormones like human chorionic gonadotropin, progesterone, estrogen which are important for maintaining pregnancy). The amnion is a membrane that contains amniotic fluid and cushions the fetus. The chorion is one of the fetal membranes. Chorionic villi are finger - like projections on the chorion that are involved in early nutrient and gas exchange but are not the main structure with all the functions (nutrition, excretion, respiration, endocrine) mentioned in the question after 14 - 16 weeks.

Answer:

Placenta