The parity of various types of estrogen - a hormone made by a placenta, starts the mechanism of sorts, scientists speak. Such opening will allow to prevent premature birth.

The mechanism controlling the beginning of patrimonial activity, long time remained a riddle, but scientists under the guidance of Roger Smith from John Hunter's hospital in Newcastle (Australia) can detain or accelerate now process.
There are two types of estrogen: Oestradiolum (E2) and a theelol (E3). Balance E2 and E3 is characteristic for a normal current of pregnancy. Balance disturbance - starts process of sorts. Scientists have analysed parity E3 and E2 at 500 pregnant women and have seen, that growth E3 stimulates patrimonial activity.

Earlier scientific have found out, that the kortikotropin-rilizing-hormone raises on all extent of pregnancy and reaches a maximum during sorts.

Also it has appeared, that kortikotropin-rilizing-hormone influences foetus adrenals, stimulating emission of a steroid hormone which influences manufacture by placenta E3. It was found out, that level Е3 very much depends on level kortikotropin-rilizing-hormone.

«kortikotropin-rilizing-hormone becomes the catalyst of the beginning of sorts, lifting manufacture of a steroid hormone at a foetus which raises level E3 so, that it becomes more than hormone E2», - Smith makes comments. - «This dependence explains why the child dying in a uterus, also causes the beginning of sorts. Dropping of level E3 in comparison with E2 also starts labours».
Supervising a parity between hormones, it is possible to detain labours.