Question

In pregnant women having prolonged labor pains, childbirth has to be hastened. It is advisable to administer a hormone that can
A.Activate the smooth muscles
B.Increase the metabolic rate
C.Release glucose into the blood
D.Stimulate the ovary

Answer 1

Hint:During childbirth or parturition, there is labor pain which is contractions of smooth muscles that will help in the dilation of the cervix as well as the vaginal canal in order to push the baby downward to help in the childbirth.

Complete answer:During the process of parturition, the prostaglandins initiate the contraction of smooth muscles of the uterine wall which are termed as labor pains. The fetus's head causes pressure against the cervix that further sends signals to the hypothalamus to trigger the release of oxytocin. Both oxytocin and prostaglandins initiate uterine smooth muscle contraction. The prolonged labor pains can cause complications that delay the birth of the baby. Generally, at this stage, in order to have a safe delivery, the woman is injected with hormones that activate smooth muscles. This will dilate and contract the canal which will help the baby to come out. There is no effect of increasing the metabolic rate or level of glucose in the blood. Stimulation of the ovary will have no effect on the birth process.
Among the given options:
The thyroxine, a thyroid hormone is responsible for the stimulation of metabolic rate, growth, and development.
The glucagon hormone in the pancreas is responsible for breaking down glycogen into glucose in the liver which further increases the blood glucose level.
The FSH and LH which are the gonadotropic hormones stimulate the ovary for egg production and release of sexual hormones. They do not have a primary role during parturition.
So, the option A is correct.

Additional Information:
The blood volume in the body during pregnancy increases by 40 to 50 percent. This increase helps with the extra oxygen needed to support a healthy pregnancy.

Note:Foetal ejection reflex is the signal that the fully developed fetus sends through the placenta which induces muscular contractions. The time period from fertilization to childbirth is called the gestation period.