Placenta, Biology

PLACENTA -

A common tissue of foetus & mother (uterus) which is physical, physiological & endocrinal connection is known as placenta.

FUNCTION -

To provide nutrients to foetus. To remove metabolic waste. Helpful in respiration. Store food in the form of glycogen.

It produces estrogen, prgesteron & relaxin.

Note :- A placenta consists of 6 tissues. Three from the foetal walls & 3 from mother's uterus.

The foetal tissues are -

1.       Foetal endometrium i.e. blood capillaries.

2.       Connective tissue.

3.       Chorionic epithelium

The maternal tissue are -

1.       Mucous epithelium of uterine walls

2.       Connective tissue

3.       Maternal endothelial

According to the presence or absence of any of these tissues the placenta may be of many types.

In man placenta is of following types -   1. Haemochorial       2. Discoidal       3. Decidute

1. HAEMOCHORIAL - All maternal tissues are eraded so that chorionic epithelium is bathed directly in the maternal blood (present in irregular spaces or sinuses).

2. DISCOIDAL - Where villi develop only on one side so that it looks like a disc.

3. DECIDUATE - Close relation between trophoblastic villi & uterine wall. At the time of birth considerable bleeding & tearing of tissues.

Posted Date: 10/3/2012 6:06:53 AM | Location : United States







Related Discussions:- Placenta, Assignment Help, Ask Question on Placenta, Get Answer, Expert's Help, Placenta Discussions

Write discussion on Placenta
Your posts are moderated
Related Questions
How are glycosidic bonds formed? The anomeric hydroxyl group and a hydroxyl group of another sugar or some other compound can join together, splitting out water to form a glyco

Digestion of various disaccharides of the diet The enzymes from brush border membrane of small intestine complete the digestion of various disaccharides of the diet and the pro


Question 1 Write a short note on the following- Structure of DNA. Satellite DNA Transcription. pBR 322 vector Cytokines Microarrays Question 2 What is

It is a newer agent that inhibits cholesterol absorption by the enterocyte. It reduces cholesterol absorption by the enterocyte. It reduces cholesterol absorption by 23 per cent-50

As coenzymes participate in a variety of functions, they can be classified broadly into two groups: i)  Hydrogen transferring  coenzymes, and ii)  Group transferring coenzym


Electro magnetic radiation Light is one form of energy. The light rays consist of tiny particles called photons. The energy carried by photon is called quantum. Light

H Y ALURONI C ACID It is formed by alternating unit of D-glucuronic acid and N-acetylglucosamine. Hyaluronic acid acts as animal cement between adjacent animal cells

What do you determine by Mantle? A thin sheetlike membranous extension of visceral mass of molluscs which forms two flaps of skin. Mantle secretes the shell on the dorsal side