Nokea
The uterus is located:
- A. in the pelvic cavity;
- B. posterior to the urinary bladder;
- C. anterior to rectum;
- D. above the vagina;
Correct Answer: A
Rationale: The correct answer is A: in the pelvic cavity. The uterus is a female reproductive organ situated in the pelvic cavity. It is where the fertilized egg implants and develops during pregnancy. The uterus is located between the bladder (anteriorly) and the rectum (posteriorly). Therefore, it is not posterior to the urinary bladder (B), anterior to the rectum (C), or above the vagina (D). The correct placement of the uterus in the pelvic cavity ensures proper support and function for reproduction.
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Which of the following cells secrete testosterone
- A. spermatocytes
- B. oocytes
- C. anterior pituitary cells
- D. leydig cells
Correct Answer: D
Rationale: Rationale:
1. Leydig cells are located in the testes and are responsible for secreting testosterone.
2. Testosterone is a male sex hormone crucial for the development of male reproductive tissues.
3. Spermatocytes and oocytes are involved in gamete production, not testosterone secretion.
4. Anterior pituitary cells secrete hormones like FSH and LH, not testosterone.
Summary:
Leydig cells secrete testosterone in the testes, making them the correct choice. Spermatocytes, oocytes, and anterior pituitary cells are not involved in testosterone secretion.
The function of the epididymis is
- A. Sperm maturation
- B. Produce sperm
- C. Spermatid storage
- D. Provide nutrition to sperm
Correct Answer: A
Rationale: The correct answer is A: Sperm maturation. The epididymis is a coiled tube where sperm undergo maturation, gaining motility and ability to fertilize an egg. It does not produce sperm (incorrect B), but stores sperm for a short period (incorrect C) before ejaculation. It also does not provide nutrition to sperm (incorrect D).
Human chorionic gonadotropin (hCG) produces fluid that activates sperm.
- A. prostatic urethra
- B. ovary.
- C. prostate
- D. corpus luteum.
Correct Answer: D
Rationale: The correct answer is D: corpus luteum. Human chorionic gonadotropin (hCG) is produced by the developing placenta during pregnancy. This hormone helps maintain the corpus luteum, which in turn produces progesterone to support the pregnancy. The fluid produced by the corpus luteum helps activate sperm for fertilization. Choices A, B, and C are incorrect as they are not directly involved in the production of hCG or the activation of sperm.
If a radioimmunoassay is properly conducted and the amount of radioactive hormone bound to antibody is low, this would indicate which of the following?
- A. Plasma levels of endogenous hormone are high
- B. Plasma levels of endogenous hormone are low
- C. More antibody is needed
- D. Less radioactive hormone is needed
Correct Answer: A
Rationale: The correct answer is A: Plasma levels of endogenous hormone are high. When the amount of radioactive hormone bound to the antibody is low in a radioimmunoassay, it indicates that there is a high concentration of non-radioactive, endogenous hormone present in the sample competing for binding sites on the antibody. This competition results in fewer radioactive hormones binding to the antibody. Therefore, the low radioactive hormone binding suggests an abundance of non-radioactive hormone in the sample.
Choice B is incorrect because low levels of radioactive hormone binding do not indicate low plasma levels of endogenous hormone. Choice C is incorrect as more antibody wouldn't affect the binding of radioactive hormone if endogenous hormone levels are high. Choice D is incorrect because the amount of radioactive hormone needed is not related to the binding observed in the assay.
Which of the following is not compatible with penile erection?
- A. parasympathetic stimulation
- B. arterial dilation
- C. venous compression
- D. blood leaves erectile tissue
Correct Answer: D
Rationale: The correct answer is D: blood leaves erectile tissue. During penile erection, blood flows into the erectile tissue, causing the penis to become erect. Parasympathetic stimulation and arterial dilation are essential for promoting blood flow into the penis, while venous compression helps to trap blood within the erectile tissue, sustaining the erection. However, if blood were to leave the erectile tissue, it would result in a loss of erection. Therefore, choice D is not compatible with penile erection.