23. A sharp spike in estrogen, increased placetal CRH, increased fetal ACTH and

Question

23. A sharp spike in estrogen, increased placetal CRH, increased fetal ACTH and increased fetal DHEA causes the initiation of a. organized labor contractions b. menstruation c ovulation d. lactation e. menarche 24. The organ that surrounds the urethra and produces PSA. proteolytic enzymes, and seminalplasmin is the: a. seminal vesicles b. bulboruethral gland c. prostate gland d. preputial gland e. Bartholin's gland 25. In the follicular phase of the ovarian cycle, the ovary is: a. undergoing atresia b. forming a corpus luteum c. releasing a mature oocyte e. maturing a follicle 26. The actions of estrogens in the female include all of the following EXCEFT a. promote development and maintenance of female secondary sex characteristics b. increased cell division c. promotes protein anabolism d. promotes blood clotting e. relaxation of uterine smooth musele 27. In male body builders who are injecting supplemental anabolic steroids, the term all show and no go" would mean: spermatogenesis is accelerated and sperm are not fully developed before a. ejaculation b. spermatogenesis is reduced due to low testicular androgen levels c. positive feedback increases testosterone secretion by the testes and sex drive is significantly decreased due to high circulating androgens body builder has no time for sex d. e. 28. The layer of the embryonic disk that eventually develops into the endocrine system is the: b. mesoderm c. ectoderm

Explanation / Answer

23. Ovulaiton

Explanation: A sharp spike in estrogen level occurs before ovulation.

24. Prostate Gland

Explanation: It produces PSA (Prostate specific antigen) which is used for screening of prostate cancer

25. Maturing a follicle

Explanation: All other options are of luteal phase, which comes after follicular phase

26. E

Explanation: Relaxation of uterine smooth muscles takes place by the hormone - Relaxin

27. B

Explanation: Abuse of anabolic steroids or androgens derivatives commonly results in oligospermia or azoospermia. This androgen abuse can develop abnormalities in sperm and it’s motility. This abuse induces negative feedback on the pituitary, that leads to inhibition of the secretion of FSH and LH.

28. Endoderm

Explanation: The endocrine system develops from all 3 germ layers, however the major role is of endoderm.

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