Question

Secondary sexual characters in females develop in response to the hormone.
a. Relaxin
b. Progesterone
c. Estrogen
d. Gonadotropin

Answer 1

Hint: Hormones are the chemical messengers, that generally produce by the endocrine glands and are released into the bloodstream, they play a very important role in the growth and development of the whole body, while sex hormones are important in the development of reproductive organs and their maturation.

Complete answer:
Sexual hormones in females are estrogen and progesterone.
- Though progesterone is usually a male sex hormone, it is important to have it too.
- Generally, the release of any hormones is controlled by the hypothalamus.
- In females, if the reproductive organs come to maturation, then signals are pass to the hypothalamus, where it is sent to the pituitary gland and release the gonadotropin-releasing hormone, and they act on follicles so that mature follicles release follicle-stimulating hormone and luteinizing hormone.
- In general, during the ovarian cycle, after the maturation of the follicle which occurs from 15th to 28th day, where it releases the corpus luteum, this release the sex hormones called estrogen and progesterone in females.

> Estrogen: It is a very important female sex hormone.
- Most of the estrogen is produced by the ovaries and some amount of the estrogen is secreted by the adrenal glands and fats.
- They play a very important role in the menstrual cycle and estrogen is responsible for the development of secondary sexual characters in females.
- So estrogen is the correct answer.

> Progesterone: Although it is a male hormone, some amounts are required in females.
- Progesterone level increases during the ovulation.
- To stabilize the periods and to maintain the pregnancy, progesterone is very important.
- Low levels of progesterone may cause irregular periods, problems for pregnancy.

Hence, The correct answer is option (C).

Note: Both male and female sex hormones have functions of, puberty, reproductive organs development and they play role in sexual desire and bone and muscle growth and development and maintain the cholesterol levels and hair growth, etc.