Question

The foetus ejection reflex in humans triggers the release of
A. Human chorionic gonadotropin from placenta
B. Oxytocin from foetal pituitary
C. Oxytocin from maternal pituitary
D. Human placental lactogen from placenta

Answer 1

The uterus is a single which is called womb. The endometrium undergoes cyclic changes during the menstrual cycle while the myometrium exhibits strong contraction during the delivery of a baby. During this, several hormones are released up in the body which facilitates the delivery of a baby.

Complete answer:
The average duration of pregnancy in humans is about 9 months which is called the gestation period. Vigorous contraction of the uterus takes place at the end of the pregnancy that causes expulsion of the foetus. This process is called a parturition. It induces the complex neuroendocrine mechanism.
The signals are sent from a well developed foetus and the placenta that induces the mild contraction which is called the foetus ejection reflex. This triggers the release of oxytocin from the maternal pituitary. Oxytocin acts on the uterine muscles and causes the strong uterine contraction that further stimulates secretion of oxytocin. The stimulatory reflex between the uterine contraction and oxytocin secretion continues resulting in stronger and stronger contraction. This leads to expulsion of the baby out of the uterus through the birth canal through the process of parturition.
The mammary glands of the females undergo differentiation during the process of pregnancy and start producing milk towards the end of pregnancy by the process of lactation. This helps in the feeding of the new born baby. The milk that is produced during the initial days of lactation is called a colostrum that contains many antibodies that are essential for the new born babies to fight against diseases.

So, the correct answer is “Option A”.

Note:
The first sign of growing foetus may be noticed by listening to the heart beat. By the end of the second month of pregnancy, the foetus develops its limbs and digits anad by 12 weeks it develops it organ system level of organisation. The first movement of foetus and appearance of the hair and head is usually observed in the fifth month. By the end of 24 weeks, the child is covered with hairs, eyelids separate and eyelashes are formed. By nine month it is fully developed.