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Introduction to the Female Reproductive System

Which of the ...

Question

Which of the following hormones is secreted by implanted blastocyst, that acts on the corpus luteum in the ovary, stimulating the body to produce estrogens and progesterone to maintain the uterine lining?

A

Estrogen

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B

hCG

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C

Progesterone

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D

Oxytocin

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Solution

The correct option is B hCG
The implanted blastocyst secretes a hormone, a human chorionic gonadotropin (hCG), that acts on the corpus luteum in the ovary, stimulating the body to produce estrogens and progesterone to maintain the uterine lining. Human chorionic gonadotropin is a glycoprotein composed of 237 amino acids.
Thus, the correct option is (B).

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Q. Complete the paragraph with the help of words given in the bracket. (Luteinizing hormone, endometrium of uterus, follicle stimulating hormone, estrogen, progesterone, corpus luteum)

Growth of follicles present in the ovary occurs under the effect of ----- This follicle secretes estrogen. -- --- - -- -- -- grows / regenerates under the effect of estrogen. Under the effect of --- ---, fully grown up follicle bursts, ovulation occurs and -- --- -- -- is formed from remaining part of follicle. It secrets --- --- -- -- and --- --- -- -- --. Under the effect of these hormones, glands of -- -- -- -- are activated and it becomes ready for implantation.

Q. Refer to the given schematic representation of menstrual cycle showing three phases I, II and Ill.

Select the option that correctly matches these phases with the following events.

(i) FSH secreted by the anterior pituitary stimulates the ovarian follicle to secrete estrogen which stimulates the proliferation of the endometrium.

(ii) LH secreted by the anterior pituitary stimulates the development of corpus luteum which secretes progesterone.

(iii) Reduced production of LH from anterior pituitary causes degeneration of corpus luteum, thereby progesterone production is reduced.

Q. Which one of the following hormones stimulates the corpus luteum to secrete a hormone?

Q. Estrogen and progesterone secreted by the ovary are _________ hormones.

Q. Assertion :Corpus luteum is produced by Graafian follicle after ovulation. Reason: It secretes estrogen which is necessary to maintain pregnancy.

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