Question

Estrogen are secreted by
A. Follicle cells
B. Ovary
C. Germinal epithelium
D. Stroma

Answer 1

Hint: Steroid that functions as a hormone known as steroid hormone. Estrogen is a steroid hormone. Estrogen also called the primary sex hormone or female fundamental hormone.

Complete step by step answer: Let first discuss ovulation process. Ovulation is a realization of ovule from rupture of the Graafian follicle. Rupture Graafian follicle also known as Corpus luteum. The ovary contains the follicles.
The secretion of gonadotropin hormone LH and FSH increases during the phase of follicle development which stimulates the development of the primary follicle into the Graafian follicle in the ovary. Gonadotropin hormone also induces the release of estrogen from the Graafian follicle. Graafin follicle is a mature follicle in the ovary that acts as an endocrine gland and secretes estrogen.
The placenta connects the uterus to foetus. It provides nutrition to the foetus from the maternal tissue and excretes the foetus waste from the foetus. Placenta also acts as an endocrine hormone and releases human chorionic gonadotropin hormone, estrogen, and progesterone.
So from the above option the correct option is (A).
Additional Information:
The function of estrogen is as follows-
1. It regulates the secondary sexual character in females.
2. It helps in the menstrual cycle.
3. It helps in regeneration of the inner layer of the uterus(endometrium).
4. It is also used as birth control medicine.
5. In males estrogen is present in a low amount but plays a significant role. In males, estrogen maintains certain features of the reproductive system important to the development of sperms.

Note: Progesterone is also a steroid ovarian hormone that also plays a role in reproductive growth in the female. Progesterone is known as a pregnancy hormone. Progesterone released by corpus luteum. When the level of progesterone is high the uterus is prepared for the implantation of the blastocyst.