62. Long answer questions VI

 

a. The placenta is a Disc-shaped structure that attaches the uterine wall and the developing embryoIt serves as a temporary intimate connection between the foetus and the uterine wall to exchange certain materialsIt contains villi on the embryo's side of the tissueAll the statements are correct.

 

b. The placenta is connected to the embryo through a cord containing blood vessels called the epididymisumbilical cordfallopian tube. It helps in the transport of substances to and from the embryo.

 

c. oxygen passes from the maternal blood to the foetus through the placenta, and carbon dioxide passes in the reverse direction.

 

d. The placenta does not serve as a barrier and permits all substances to enter the blood of the foetus.

 

e. Placenta secretes hormones like thyroxine, progesterone, adrenaline and relaxin.