Placenta, Biology

Assignment Help:

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.


Related Discussions:- Placenta

Why dietary supplements do not speed up a child''s growth, Why Dietary supp...

Why Dietary supplements do not speed up a child's growth? Dietary supplements do not "speed up" a child's growth and development: There is no scientific evidence that me

If cell itself was hypertonic to the solution, What would happen to a cell ...

What would happen to a cell if it was placed into a hypertonic solution? Into a hypotonic solution? What would happen to a cell if the cell itself was hypertonic to the solution?

Major objectives of diarrhoea, Q. Major objectives of diarrhoea? The ma...

Q. Major objectives of diarrhoea? The major objectives in the management of diarrhoea include: 1. Fluid and electrolyte replacement 2. Removal of cause (especially if inf

What are plant cell vacuoles, What are plant cell vacuoles? What are their ...

What are plant cell vacuoles? What are their functions? How is the covering membrane of the vacuoles called? Ans) Plant cell vacuoles are cell structures delimited by membranes

Explain the prevalence of iron deficiency anaemia, Explain the Prevalence o...

Explain the Prevalence of iron deficiency anaemia? We can find out about the prevalence of anaemia if we know what percentage of population is suffering from anaemia. The WHO h

Cardiovascular endurance component for physical fitness, Define Cardiovascu...

Define Cardiovascular endurance Component for physical fitness? In our previous section on work capacity, concepts of aerobic capacity Vo2 max were described. Cardiovascular en

What is osmotic pressure, What is osmotic pressure? Osmotic pressure is...

What is osmotic pressure? Osmotic pressure is the pressure formed in an aqueous solution by a region of lower solute concentration upon a region of higher solute concentration

State whether the factor can lead, With your understanding of bone and musc...

With your understanding of bone and muscle tissue (cells and the extracellular material) discuss two lifestyle factors (one for bone and one for muscle) that affect the growth, dev

What is pulmonary embolism surgery indications, What is Pulmonary Embolism ...

What is Pulmonary Embolism Surgery Indications ? Indications for Surgery :  Acute pulmonary embolism with haemodynamic instability and hypoxaemia is nearly always fatal. Mor

What are the stages of mitosis, Q. What are the stages of mitosis? Mito...

Q. What are the stages of mitosis? Mitosis involves replication of DNA and its separation into two new daughter cells. Whereas only four phases of mitosis are often listed. Ent

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd