what is placenta uterus

Placenta - 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 dep..

Placenta is the mechanical and physiological connection between foetal and maternal tissues for the nutrition, respiration and excretion of the foetu..

is a pear-shaped structure, broader on the upper end and narrower on the lower end. The upper end is called the body of the uterus and the lower end is called the cervix. At the upper end, it receives the oviducts of either side whereas the lower end the cervix opens into the vaginal can..

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..

The cyclic changes in the ovary and uterus are under the control of estrogen and progesterone hormones whose secretion is under the control of gonadotropic hormones secreted by anterior pituitar..

. 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 preparation by the uterus for receiving the fertilized egg or the zygote. ..

>Once the egg is fertilised, ovulation and menstruation do not take place. The fertilised structure, now called the zygote is diploid. It starts dividing and forms a blastocyst, the first stage of an embryo. The blastocyst gets implanted on the uterine walls. It then grows into a foetus. The foetus..

>Once a sperm enters an egg, the thickening of the outer walls of the egg blocks the entry of other sperms. Once the egg is fertilised, ovulation and menstruation do not take place. The fertilised structure, now called the zygote is diploid. It starts dividing and forms a blastocyst, the first stag..

. After fertilisation, the fertilised ovum trickles down into the uterus for implantation. Cleavage is the process which transforms the fertilised ovum into a sphere of closely aggregated cells. The fertilised ovum divides repeatedly in close succession to form blastomeres. Cleavage divis..

. 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..