Nokea
When do the corona radiata cells appear?
- A. at birth
- B. 12 days
- C. 28 days
- D. 1 day
Correct Answer: A
Rationale: The corona radiata cells appear at birth because they are a crucial part of the ovum and are present as soon as the ovum is released from the ovary. The other choices are incorrect because corona radiata cells are not formed at 12, 28, or 1 day after birth. They are specifically associated with the ovum and its release during ovulation, making option A the most accurate.
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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.
When men age, what is the effect of prostate gland enlargement?
- A. It compromises the ability to fertilize ova
- B. It compromises erectile function
- C. It compromises urination
- D. It compromises sperm production
Correct Answer: C
Rationale: Prostate gland enlargement commonly affects urination by obstructing the urethra.
Floating ribs of the thoracic cage are
- A. 1-7 ribs
- B. 8-10 ribs
- C. 11, 12 ribs
- D. None of the above
Correct Answer: C
Rationale: The correct answer is C: 11, 12 ribs. Floating ribs are ribs that do not have a direct attachment to the sternum. Ribs 11 and 12 are considered floating ribs because they do not attach to the sternum or cartilage of other ribs, only to the vertebrae in the back. Choices A and B are incorrect because ribs 1-10 are not considered floating ribs. Choice D is incorrect because ribs 11 and 12 are indeed the floating ribs of the thoracic cage.
The prostate:
- A. is located under the urinary bladder;
- B. is located around the initial segment of the urethra;
- C. is an accessory gland of the male reproductive system;
- D. secretes androgenic hormones;
Correct Answer: C
Rationale: Step-by-step rationale:
1. The prostate is an accessory gland because it produces and secretes fluid that nourishes and protects sperm.
2. It is not located under the urinary bladder (A) but surrounds the initial segment of the urethra (B).
3. The prostate does not secrete androgenic hormones (D); instead, it secretes prostate-specific antigen (PSA) and enzymes.
4. Thus, the correct answer is C because it accurately describes the function of the prostate as an accessory gland of the male reproductive system.
The following secondary sexual characteristics are influenced by the testosterone:
- A. skeleton;
- B. voice;
- C. the secretory modification of the spermatogenic epithelium;
- D. the distribution of excess fat;
Correct Answer: B
Rationale: Step-by-step rationale:
1. Testosterone is a male sex hormone responsible for developing secondary sexual characteristics.
2. Voice deepening is a well-known secondary sexual characteristic influenced by testosterone.
3. Testosterone affects the larynx, causing vocal cords to lengthen and thicken, leading to a deeper voice.
4. Skeleton development is mainly influenced by growth hormones, not testosterone.
5. Secretory modifications in spermatogenic epithelium are regulated by other hormones like FSH and LH, not testosterone.
6. The distribution of excess fat is influenced by various factors like genetics and metabolism, not specifically testosterone.
Summary:
Voice deepening (choice B) is the correct answer as it is a well-known secondary sexual characteristic influenced by testosterone. Choices A, C, and D are incorrect as they are not directly influenced by testosterone in the context of secondary sexual characteristics.