Nokea
Which hormone is primarily produced by the corpus luteum?
- A. Follicl
- B. stimulating hormone (FSH)
- C. Progesterone
- D. Testosterone
Correct Answer: C
Rationale: The correct answer is C: Progesterone. The corpus luteum is a temporary endocrine structure in the ovaries that forms after ovulation. Its main function is to produce progesterone, which helps prepare the uterine lining for implantation of a fertilized egg. Follicle stimulating hormone (FSH) is produced by the pituitary gland to stimulate follicle development, not by the corpus luteum. Testosterone is mainly produced by the testes in males and a small amount by the ovaries in females, not by the corpus luteum. Progesterone is the key hormone produced by the corpus luteum, making choice C the correct answer.
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What is the source of the male sex hormones?
- A. epididymis
- B. vas deferens
- C. seminiferous tubules
- D. interstitial cells
Correct Answer: D
Rationale: The correct answer is D: interstitial cells. Interstitial cells, also known as Leydig cells, are located in the testes and are responsible for producing male sex hormones, primarily testosterone. The other choices, A: epididymis, B: vas deferens, and C: seminiferous tubules, are not directly involved in the production of male sex hormones. The epididymis is a structure for sperm maturation, the vas deferens is a duct for transporting sperm, and the seminiferous tubules are responsible for sperm production through spermatogenesis. Therefore, interstitial cells are the source of male sex hormones, making choice D the correct answer.
A mother asks a nurse when her daughter should get immunized again for human papilloma virus (HPV). What is the nurse’s most appropriate response to this question?
- A. Your daughter does not need this immunization until she becomes sexually active.
- B. The recommended age for this immunization is between 25 and 30 years of age.
- C. Between the ages of 11 and 26 years is the recommended time for this immunization.
- D. When she begins having menstrual periods is the best time for this immunization.
Correct Answer: C
Rationale: The correct answer is C: Between the ages of 11 and 26 years is the recommended time for this immunization. The HPV vaccine is recommended for females aged 11-26 to prevent HPV infections, which can lead to cervical cancer. Starting vaccination early provides the best protection before potential exposure to the virus. Option A is incorrect as waiting until sexual activity can leave the individual vulnerable to HPV. Option B is incorrect as the recommended age range is 11-26, not 25-30. Option D is incorrect as the timing of menstrual periods is not a factor in determining when to get the HPV vaccine.
Which of the following is a steroid?
- A. FSH
- B. LH
- C. estrogen
- D. GnRH
Correct Answer: C
Rationale: The correct answer is C: estrogen. Estrogen is a type of steroid hormone derived from cholesterol. Steroids are a specific group of lipids characterized by a particular molecular structure. Estrogen plays a vital role in the development and regulation of the female reproductive system.
Choice A, FSH, and choice B, LH, are both peptide hormones, not steroids. Peptide hormones are made up of amino acids and are not derived from cholesterol.
Choice D, GnRH, is also a peptide hormone that regulates the release of other hormones in the body, particularly in the reproductive system.
In summary, estrogen is the only steroid hormone among the options provided, making it the correct choice.
Testosterone is secreted by the following structures, EXCEPT:
- A. prostate;
- B. testicular interstitial cells;
- C. seminiferous tubules;
- D. straight tubules;
Correct Answer: A
Rationale: The correct answer is A: prostate. Testosterone is primarily secreted by the testicular interstitial cells (Leydig cells) in the testes. The seminiferous tubules are responsible for spermatogenesis, not testosterone secretion. Straight tubules are involved in transporting sperm. The prostate gland produces prostatic fluid, not testosterone. Therefore, the prostate is not a structure that secretes testosterone.
Where does fertilization usually occur in the female reproductive system?
- A. Ovary
- B. Vesicular (Graafian) follicle
- C. Uterine (fallopian) tubes
- D. Uterus
Correct Answer: C
Rationale: The correct answer is C, the uterine (fallopian) tubes. This is where fertilization usually occurs as it is the site where the egg and sperm meet. The egg is released from the ovary and travels through the fallopian tube where it can be fertilized by sperm. If fertilization occurs, the resulting embryo will then travel to the uterus for implantation. The other choices are incorrect because fertilization does not typically occur in the ovary (A) or vesicular (Graafian) follicle (B). While the uterus (D) is where the embryo implants and develops into a fetus, fertilization itself does not occur there.