what is placenta pregnancy

Nutrition Placenta helps to transport nutrients from maternal blood into foetus Respiration It helps in getting oxygen from the maternal blood into the foetus and CO 2 from foetus blood into the maternal blood. Excretion Nitrogenous waste products produced in the embryo diffu..

Placenta is the mechanical and physiological connection between foetal and maternal tissues for the nutrition, respiration and excretion of the foetus. The surface of the blastocyst gives rise to finger - like outgrowths called chorionic villi which penetrate into depressions on the wall ..

The hormone progesterone is continually required during the entire period of pregnancy. Hence this hormone is aptly referred to as pregnancy hormone. Pregnancy can be classified into 2 main stages: a) Crucial first 3 months (trimester) b) Post trimester During the firs..

Progesterone is secreted by the corpus luteum which is a yellowish body formed in the empty graafian follicle after the release of the ovum. Ovulation, formation of corpus luteum and secretion of progesterone are stimulated by the luteinising hormone from the anterior pitutary. The main functions ..

. This causes the production of anti-Rh anti bodies in the mother's blood. If the women becomes pregnant again, her anti-Rh antibodies will cross the placenta and reach the blood stream of the foetus. If the foetus is Rh - no problem will occur. If the foetus is Rh+, an antigen - antibody..

. The stage when the reproductive system starts functioning is called puberty. In males, puberty sets in between 13 to 15 years and in females, it sets in by the age of 11 to 13 years. The onset of puberty in females is also marked by a monthly event called menstruation cycle. This involves prepara..

In this type, the ovary is monocarpellary, monolocular and the placenta is on the ventral suture. The ovules are attached to the placenta which is on the margin. e.g. Beans, Pea, et..

The arrangement of ovules on the placenta inside the ovary is called placentation. There are several types of palcentatio..

It stores the nitrogenous wastes of the embryo, so it acts as an extra embryonic kidney. In eutherian mammals it takes part in placenta formati..

.: It stimulates the growth of milk glands during pregnancy and secretion of milk after delivery. Improper secretion of Growth hormone produces three important disorder..