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s**t have to hand re done essay in in 1 hour and need some desperate help please please please

(6 Posts)
nikcola Tue 03-May-05 11:18:08

im trying to find the hormones involved in labour have tryed all 4 of my book and the net cant find nough ?????? need to write abpout 150 words on it

Rhubarb Tue 03-May-05 11:21:04

Try NCT website, you could even telephone them and quote what they say as a kind of interview!

Mum2girls Tue 03-May-05 11:21:12

Birth
Toward the end of pregnancy,
Secretion of estrogen by the placenta rises. This rise is triggered by the fetus itself:
The placenta releases CRH which stimulates the pituitary of the fetus to secrete
ACTH, which acts on the adrenal glands of the fetus causing them to release the estrogen precursor dehydroepiandrosterone sulfate (DHEA-S).
This is converted into estrogen by the placenta.


The rising level of estrogen causes the smooth muscle cells of the uterus to
synthesize connexins and form gap junctions. Gap junctions connect the cells electrically so that they contract together as labor begins.
express receptors for oxytocin
Oxytocin is secreted by the posterior lobe of the pituitary as well as by the uterus.
A number of prostaglandins also appear in the mother's blood as well as in the amniotic fluid.
Both oxytocin and prostaglandins cause the uterus to contract and labor begins.
Three or four days after the baby is born, the breasts begin to secrete milk.

Milk synthesis is stimulated by the pituitary hormone prolactin (PRL), and
its release from the breast is stimulated by oxytocin.
Milk contains an inhibitory peptide. If the breasts are not fully emptied, the peptide accumulates and inhibits milk production. This autocrine action thus matches supply with demand.
Other Hormones
Relaxin
As the time of birth approaches in some animals (e.g., pigs, rats) , this polypeptide has been found to:
relax the pubic ligaments
soften and enlarge the opening to the cervix.
Relaxin is found in pregnant humans but at higher levels early in pregnancy than close to the time of birth. Relaxin promotes angiogenesis, and in humans it probably plays a more important role in the development of the interface between the uterus and the placenta that it does in the birth process.

Activins, Inhibins, Follistatin.
These proteins are synthesized within the follicle. Activins and inhibins bind to follistatin. Activins increase the action of FSH; inhibins, as their name suggests, inhibit it. How important they are in humans remains to be seen. However the important role that activin and follistatin play in the embryonic development of vertebrates justifies mentioning them here.

gggglimpopo Tue 03-May-05 11:21:13

here

expatinscotland Tue 03-May-05 11:21:15

One of them is oxytocin.

nikcola Tue 03-May-05 11:24:54

THANK YOU {{{{{{{{{}}}}}}}}}}}}

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