Nokea
Which hormone inhibits the release of FSH from the pituitary gland?
- A. Inhibin
- B. Relaxin
- C. GnRH
- D. hCG
Correct Answer: A
Rationale: Rationale:
1. Inhibin is produced by the ovaries and testes in response to FSH stimulation.
2. Inhibin acts as a negative feedback signal to inhibit further FSH release.
3. This mechanism helps regulate the levels of FSH in the body.
Summary:
- Relaxin is a hormone involved in pregnancy and does not directly inhibit FSH release.
- GnRH stimulates FSH release rather than inhibiting it.
- hCG is produced during pregnancy and does not have a direct role in inhibiting FSH secretion.
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When instructing a patient about the risk factors associated with breast cancer, which one of the following should be identified as a myth?
- A. Breast cancer often follows an injury to the breast
- B. The incidence of breast cancer increases with age
- C. Women whose mothers or sisters have had breast cancer are twice as likely to develop it
- D. A diet high in animal fat has been linked with an increased incidence of breast cancer
Correct Answer: A
Rationale: The idea that breast cancer often follows an injury to the breast is a myth; there is no evidence supporting this claim.
Which of the following sexually transmitted infections is caused by Treponema pallidum?
- A. Herpes
- B. Venereal warts
- C. Gonorrhea
- D. Syphilis
Correct Answer: D
Rationale: Syphilis is caused by the spirochete bacterium Treponema pallidum.
Sperm maturation occurs in the
- A. seminiferous tubules
- B. epididymis
- C. vas deferens
- D. urethra
Correct Answer: B
Rationale: The correct answer is B: epididymis. Sperm maturation occurs in the epididymis, a coiled tube located on the posterior surface of the testes. Here, sperm undergo the process of capacitation, gaining the ability to fertilize an egg. The seminiferous tubules (choice A) are responsible for sperm production, not maturation. The vas deferens (choice C) is a duct that carries mature sperm from the epididymis to the urethra, and the urethra (choice D) is a passage for both urine and sperm but not the site of sperm maturation.
Which of the following is not a role of semen?
- A. Semen dilutes sperm.
- B. The acidity of semen helps neutralize the pH environment of a female's vagina
- C. Semen contains enzymes that enhance sperm motility.
- D. Semen contains antibiotic chemicals that destroy bacteria
Correct Answer: C
Rationale: The correct answer is C because semen does not contain enzymes that enhance sperm motility. Sperm motility is primarily influenced by the structure and health of the sperm themselves. Semen aids in sperm transport, provides nutrients, buffers the acidic vaginal environment, and contains antibiotics. Enzymes in semen primarily help with liquefaction of semen after ejaculation, not sperm motility. Choices A, B, and D are incorrect because semen does dilute sperm, neutralizes the acidic vaginal environment, and contains antibiotic chemicals, respectively.
Sterilization in the male is accomplished by excising a small portion of the:
- A. Vas deferens
- B. Ejaculatory duct
- C. Epididymis
- D. Seminal vesicles
Correct Answer: A
Rationale: The correct answer is A: Vas deferens. Sterilization in males is typically done through a procedure called a vasectomy, where a small portion of the vas deferens is excised to prevent the transportation of sperm from the testicles to the urethra. The vas deferens is the duct that carries sperm from the epididymis to the ejaculatory duct. Excising a portion of the ejaculatory duct, epididymis, or seminal vesicles would not prevent the transportation of sperm, making choices B, C, and D incorrect.