Answer all questions please and thank Which is NOT characteristic of a normal po

Question

Answer all questions please and thank

Which is NOT characteristic of a normal postpubertal male? A. Inhibin from the Sertoli cells decreases FSH secretion B. Testosterone has paracrine effects on Sertoli cells. C. Testosterone stimulates GnRH from the hypothalamus D. Testosterone inhibits LH secretion. E. GnRH from the hypothalamus is released in pulses. The Leydig cell is primarily characterized by A. Aromatization of testosterone B. Secretion of inhibin. C. Secretion of testosterone. D. Expression of receptors only in FSH. E. Transformation into the corpus luteum. 5. During the third trimester of pregnancy, the placenta is NOT the primary source of which hormone in maternal blood? A. Estrogen B. Prolactin. C. Progesterone D. inhibin. E. hCG 6. Menopause is characterized primarily by A. Primary ovarian failure. B. Loss of estrogen secretion from the ovary due to a decrease in FSH. C. Loss of estrogen secretion from the ovary due to a decrease in FSH. D. A decrease in FSH and LH due to increased inhibin E. A decrease in FSH and LH due to a decrease in GnRH pulses. 7. Anabolic effects of androgens in bone are mediated by: A. Testosterone-mediated increase in osteoblast apoptosis B. Estradiol-mediated osteoblast proliferation C. DHT-mediated osteoclast activation. D. Testosterone-mediated decrease in osteoblast proliferation.

Explanation / Answer

Ans) c) Testosterone stimulates GnRH from the hypothalamus

The GnRH stimulates the secretion of the LH and it leads to the secretion of sex steroid testosterone, estrogen and progesterone. However, there is a negative feedback that takes place where the sex steroid inhibit the secretion of GnRH.

Ans ) c) Secretion of Testosterone

The release of the gonadal hormones is responsible for characterizing the Leydig cells.

Ans) b) Prolactin

It is a luteotropic hormone which is a hormone protein that is produced by the pituitary glands of the mammals. This helps in initiating the secretion of milk through the mammary glands.

Ans) Loss of estrogen secretion from the ovary due to decrease in FSH

Ans ) b) Estradiol mediated osteoblast proliferation – This stimulates the production of estrogen which overall helps in bone anabolsim

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