Nokea
The seminal vesicle secretes:
- A. androgenic hormones;
- B. sperm cells;
- C. a fluid eliminated in the ejaculatory ducts;
- D. a fluid whose role is to transport sperm cells;
Correct Answer: C
Rationale: Step-by-step rationale:
1. The seminal vesicle secretes a fluid eliminated in the ejaculatory ducts.
2. This fluid provides nutrients and energy for the sperm.
3. It also helps to neutralize the acidic environment of the male urethra.
4. The fluid from the seminal vesicle combines with sperm to form semen for ejaculation.
Summary:
A: The seminal vesicle does not secrete androgenic hormones.
B: Sperm cells are not secreted by the seminal vesicle.
D: The seminal vesicle's fluid does not transport sperm cells; it provides support and nourishment for them.
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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.
Variations in eye color are determined by the number of pigmented cells in the:
- A. Ciliary epithelium
- B. Iris epithelium
- C. Iris stroma
- D. Corneal stroma
Correct Answer: C
Rationale: The correct answer is C: Iris stroma. The iris stroma contains melanocytes, which are responsible for producing the pigmented cells that determine eye color. These pigmented cells give the iris its color by absorbing and reflecting light. The ciliary epithelium (choice A) is not involved in determining eye color. The iris epithelium (choice B) is mainly responsible for controlling the size of the pupil, not for determining eye color. The corneal stroma (choice D) is a layer of the cornea that primarily provides structural support and transparency to the eye, but it does not play a role in determining eye color.
The urethra passes through the _____ of the penis.
- A. tunica albuginea
- B. prepuce
- C. corpora spongiosum
- D. corpora cavernosa
Correct Answer: C
Rationale: The correct answer is C: corpora spongiosum. The urethra passes through the corpora spongiosum of the penis, which is a spongy tissue that surrounds the urethra. This allows for the passage of urine and semen during ejaculation. The other choices are incorrect because: A) The tunica albuginea is a fibrous covering of the corpora cavernosa, not the urethra. B) The prepuce is the foreskin that covers the glans penis, not part of the urethra. D) The corpora cavernosa are erectile tissue responsible for penile erection, not part of the urethra's pathway.
Which of the following structures is often referred to as the bag of water?
- A. Urinary bladder
- B. Gall bladder
- C. Amniotic sac
- D. Uterus
Correct Answer: C
Rationale: The correct answer is C: Amniotic sac. This structure is often referred to as the "bag of water" because it is a fluid-filled sac that surrounds and protects the developing fetus during pregnancy. The amniotic sac provides cushioning and maintains a stable environment for the fetus to grow. It is essential for the baby's development and acts as a barrier against infections.
Choice A: Urinary bladder - This structure is responsible for storing urine and is not typically referred to as the bag of water.
Choice B: Gall bladder - This organ stores bile produced by the liver and aids in digestion, not related to pregnancy or fetal development.
Choice D: Uterus - While the uterus is involved in pregnancy and fetal development, it is not commonly referred to as the bag of water.
A man is taking a number of medications, one of which appears to be interfering with the emission phase of the sexual act. Which of the following medications could cause this problem?
- A. A medication that prolongs the duration of action of nitric oxide
- B. A medication that blocks the smooth muscle receptors for nitric oxide
- C. A medication that increases the release of nitric oxide
- D. A testosterone-like androgen compound
Correct Answer: B
Rationale: The correct answer is B because blocking the smooth muscle receptors for nitric oxide would interfere with vasodilation necessary for an erection during the emission phase of the sexual act. Choice A would actually enhance the effects of nitric oxide, Choice C would increase nitric oxide release which would typically improve sexual function, and Choice D, a testosterone-like androgen compound, would not directly affect the emission phase related to nitric oxide.