Question

Which of the following is required for the increased production of oestrogen, progesterone, cortisol, prolactin and thyroxine etc. in the maternal blood?
(i) Metabolic changes in the mother.
(ii) Maintenance of pregnancy.
(iii) Supporting the foetal growth.
(iv) Destruction of Graafian follicle.

A) (iii) and (iv)
B) (i), (iv) and (v)
C) (i), (ii) and (iii)
D) All the four statements

Answer 1

Hint: Increased synthesis of these hormones is necessary to support foetal growth, metabolic changes in the mother, and maintenance of pregnancy. During pregnancy, the levels of hormones like oestrogen, progestogens, cortisol, prolactin, thyroxine, etc., rise several fold in the mother's blood.

Complete Step by Step Answer:
The two main hormones during pregnancy are oestrogen and progesterone. One pregnancy will cause a woman to produce more oestrogen than she will in her entire life without becoming pregnant. As a result of the rise in oestrogen during pregnancy, the uterus and placenta are better able to: (the formation of blood vessels)

The corpus luteum, a tiny gland that develops in the ovary after ovulation, is where progesterone is created. This hormone is crucial for both the continuation of pregnancy and the emergence of numerous early-pregnancy symptoms.

Hence, option C is the correct answer.

Note: The mature graafian follicle, which contains the egg that has been halted in prophase of the first meiotic division, has moved to the surface of the ovary by the middle of the menstrual cycle. The follicle dramatically grows when follicle-stimulating hormone (FSH) and luteinizing hormone (LH) are present.