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
All Solid Semi-Solid Wastes Arising From Human And Animals Activities, Except Human Excreta And Sullage (Liquid Wastes From Bathrooms, Kitchens Etc.) are discarded as useless or un

How do embryos of placental mammals excrete nitrogen wastes? Placental animals, as well as embryos, excrete urea. In the adult placental mammal urea is excreted by the urine.

Q. What are the three major cell types that form the osseous tissue? What are their functions? The three major cell types of the osseous tissue are the osteocytes, the osteobla

QUESTION Behaviourists underestimate the importance of biological factors such as the inherited factors, by emphasizing the simple approach of Stimulus-Response to explain beha

#applications of biotechnology..

Q. What are the main causes of Mutation? Some mutations take place randomly and spontaneously during process of mitosis or meiosis. Others are caused by mutagenic agents that a

What do you understand by Heterotrophic? Organisms which are not capable of converting light into chemical energy. They should consume other organisms or material produced by o

Indications for Coronary Artery Bypass Surgery :  The modalities of treatment for coronary artery disease iuc: (1) medical, (2) angioplasty and stenting, and (3) coronary arte


Q. What is signifying when it is said that beings of the phylum Annelida are vascular beings? From which other phyla of the animal kingdom does this feature differentiate them?