Nokea
Which of the following represents metrorrhagia?
- A. Fewer than 21 days between menses
- B. Excessive flow
- C. Infrequent bleeding
- D. Bleeding between periods
Correct Answer: D
Rationale: Metrorrhagia is defined as irregular bleeding between periods. Choice D is correct because it accurately describes the characteristic of metrorrhagia. Choice A is incorrect because fewer than 21 days between menses refers to polymenorrhea. Choice B is incorrect as excessive flow is known as menorrhagia. Choice C is incorrect because infrequent bleeding is termed oligomenorrhea.
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Ovulation occurs in response to the release of an anterior pituitary hormone known as ________ hormone
- A. antidiuretic
- B. thyroid-stimulating
- C. luteinizing
- D. follicle-stimulating
Correct Answer: C
Rationale: The correct answer is C: luteinizing hormone (LH). LH is released by the anterior pituitary gland to trigger ovulation in females. It causes the mature ovarian follicle to release an egg during the menstrual cycle. Antidiuretic hormone (A) is involved in regulating water balance, not ovulation. Thyroid-stimulating hormone (B) stimulates the thyroid gland, not the ovaries. Follicle-stimulating hormone (D) helps in the development of ovarian follicles, but it is not responsible for triggering ovulation. Therefore, C is the correct answer as it directly stimulates the release of the egg during ovulation.
Which of the following is a false description of the negative feedback loop involved in the production of testosterone?
- A. Follicl
- B. stimulating hormone (FSH) targets the testes of males.
- C. Rising levels of testosterone promote increased release of gonadotropin releasing hormone (GnRH) from the hypothalamus.
- D. Gonadotropin releasing hormone (GnRH) is released by the hypothalamus; this hormone
Correct Answer: A
Rationale: The correct answer is A because follicle stimulating hormone (FSH) is not directly involved in the negative feedback loop for testosterone production. The negative feedback loop for testosterone involves the hypothalamus releasing GnRH, which stimulates the pituitary gland to release luteinizing hormone (LH), which then stimulates the Leydig cells in the testes to produce testosterone. Rising levels of testosterone inhibit the release of GnRH and LH through negative feedback to maintain hormonal balance. Choices B, C, and D are incorrect because they accurately describe components of the negative feedback loop for testosterone production.
How many seminiferous tubules are found in each lobule?
- A. 1-3
- B. 50-100
- C. 200-300
- D. 500 or more
Correct Answer: B
Rationale: The correct answer is B (50-100) because each lobule in the testis contains multiple seminiferous tubules where sperm production occurs. The average number of seminiferous tubules per lobule ranges from 50 to 100. This is supported by anatomical studies and research on testicular structure.
Explanation:
A: 1-3 - This is too low as each lobule contains more seminiferous tubules for efficient sperm production.
C: 200-300 - This is too high as it overestimates the number of seminiferous tubules per lobule.
D: 500 or more - This is excessive and not accurate based on scientific findings.
In summary, choice B is correct because it accurately reflects the typical range of seminiferous tubules per lobule, while the other choices either underestimate or overestimate this number.
Which of the following statements is incorrect?
- A. both luteinising hormone and follicle stimulating hormone are secreted by the hypothalamus
- B. testosterone stimulates sertoli cells
- C. luteinising hormone stimulates Leydig cells to make testosterone
- D. sertoli cells secrete inhibin
Correct Answer: A
Rationale: The correct answer is A because luteinising hormone (LH) and follicle stimulating hormone (FSH) are not secreted by the hypothalamus, but by the anterior pituitary gland. LH stimulates Leydig cells to produce testosterone, not the hypothalamus. Testosterone stimulates sertoli cells, not the other way around. Inhibin is indeed secreted by sertoli cells, but it does not relate to the incorrect statement regarding the origin of LH and FSH.
Which part of the uterus opens into the vagina?
- A. Urethra
- B. Cervix
- C. Uterine tubes
- D. Inguinal canal
Correct Answer: B
Rationale: The correct answer is B: Cervix. The cervix is the lower part of the uterus that opens into the vagina. It acts as a barrier between the uterus and vagina, and allows for the passage of menstrual flow, sperm, and a baby during childbirth. The other choices are incorrect because the urethra is a tube that connects the bladder to the outside of the body, the uterine tubes are also known as fallopian tubes that connect the ovaries to the uterus, and the inguinal canal is a passage in the abdominal wall.