Parturition , Biology

Assignment Help:

PARTURITION -

Gestation period is of 280 days (in rabbit 28 days). Parturition is the expelling of fully mature young ones from the mother's uterus.

Oxytocin stimulates the uterine contraction. It is called labour.

On the completion of gestation, labour starts. It causes labour pain.

Diaphragm is helpful in parturition. It is completed. Parturition may be devided into 3 stages -

1.      FIRST STAGE (DILATION) -

It lasts for about 12 hrs. Uterine contraction move the foetus down toward the cervix which expands fully.

Amnion & chorion are reptured. Amniotic fluid passes out, lubricate the vagina.

Foetal placenta is pulled out from the uterine wall, making the young free.

2.      SECOND STAGE (EXPULSION) -

Duration is of 20 minutes to 1 Hr.

Due to more contraction waves, the young one is pushed out word through the dilated cervix & vagina, with the head foremost and is finally delivered (born).

Relaxin dilate pelvic muscles. Umbilical cord is cut off.

3.      THIRD STAGE (PLACENTAL)-

Duration is 10-45 minutes, after infant's birth. Now uterus begins to shrink.

Placenta, umblical cord & foetal membranes are expelled by another series of uterine contraction.

Now bleeding is stoped. In about 28-35 days, uterus returns fully to its normal size.

Note :- In cesarean section, the baby is removed through a cut given in the mother's abdomen.


Related Discussions:- Parturition

Define calcium, Define Calcium, Phosphorus & Vitamin D required for Elderly...

Define Calcium, Phosphorus & Vitamin D required for Elderly? As mentioned earlier, due to the change in skeletal system, vitamin D and calcium needs increase with age. Bone min

Determine about the nervous tissues, Determine about the nervous tissues ...

Determine about the nervous tissues The nervous tissues throughout the body, including the visual nervous system, are continuously active. Electrical reactions can only be indu

Explain components of second heart sounds, Explain Components of second hea...

Explain Components of second heart sounds? The first component of S 2 is due to closure of aortic valve (A,). The second component is due to closure of pulmonary valve (P 2 ).

Drought and flood control - biodiversity, Forests, grasslands and wetland p...

Forests, grasslands and wetland protect landscapes against erosion floods and landslides through the binding action of plant roots. The root systems of plants hold soils in place,

Illustrate about dosage and administration of menactra, Dosage and  adminis...

Dosage and  administration  Menactra is given as a single intramuscular injection. The need for and timing of booster doses is unknown. An unpublished study summarized in the p

Are organic solvents like benzene and ether polar, Are organic solvents lik...

Are organic solvents like benzene and ether polar or non-polar substances? Benzene and the ethers are molecules without electrically charged portions and therefore they are non

Which hormone influence maturation of the ovarian follicles, Q. After mense...

Q. After menses what is the hormone that influences the maturation of the ovarian follicles? The maturation of the ovarian follicles after menses is stimulated by the action of

Explain iron uptake by cells, Explain Iron Uptake by Cells? Iron partic...

Explain Iron Uptake by Cells? Iron participates in a large number of biochemical reactions. However, for iron to perform any function, it first needs to be taken up by the cell

Define the food microbiology, Define the Food microbiology, mycology and to...

Define the Food microbiology, mycology and toxicology? Use of yeasts, moulds and bacteria in production of foods and food ingredients; microbes in fermentation, processing and

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