Parturition , Biology

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.

Posted Date: 10/3/2012 6:27:46 AM | Location : United States







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

Write discussion on Parturition
Your posts are moderated
Related Questions
a) The elongation level of translation in eukaryotes requires three elongation factors, eEF-IB, eEF-1A and eEF-2, that have similar functions to their prokaryotic counterparts EF-G

Explain the Steps of Exercise You have learnt the steps of exercises in Block 3, Unit 1 of theory block. Let us review the steps. In aerobic exercises one has to under go fo

Lens - Organogenesis of Eye and Limb There is much experimental proof that the lens formation in many species is dependent on the induction by the optic vesicle while it conta

Define the Requirements for Water? The body has no provision for water storage; therefore the amount of water lost every 24 hours must be replaced to maintain health and body e

A 19 year old model for Glamour magazine tripped over an extension cord causing injury to her epidermis. She is afraid the injury will leave a scar. Based on your knowledge of rege

List the five kingdoms into which most living organisms can be classified. Most living organisms can be classified as a) Bacteria, b) Protozoa, c) Fungi, d) Plants,

A cell frequently wants to secrete larger molecules than can be accommodated through the transport systems dealt with in Topic E3. Exocytoses get to the movement of proteins out of

Q What are pneumatic bones? Birds have lightweighted bones with internal spaces filled with air. These bones are called pneumatic bones this feature reduces the corporal densit

When the action potential reaches the nerve terminal it causes the let go of a chemical neurotransmitter by the synaptic vesicles. Mammalian nervous system employs many substances

Surface area The rate of oxidation increases in direct proportion to the surface area of the lipid exposed to air. Furthermore, as surface - volume ratio is increased; a given