ATI RN
Human Reproductive System Questions
Question 1 of 5
One treatment for erectile dysfunction requires the injection of a substance into the corpora cavernosa of the penis. The injection of which of the following causes an erection?
Correct Answer: C
Rationale: Alprostadil is the correct answer because it is a prostaglandin E1 analog that dilates blood vessels in the corpora cavernosa, promoting blood flow and causing an erection. Norepinephrine (choice A) constricts blood vessels and inhibits erection. A substance that inhibits nitric oxide formation (choice B) is counterproductive as nitric oxide is essential for vasodilation. Angiotensin II (choice D) constricts blood vessels and does not promote erection. Therefore, C is the correct choice for inducing an erection through vasodilation in the corpora cavernosa.
Question 2 of 5
During pregnancy, the uterine smooth muscle is quiescent. During the 9th month of gestation the uterine muscle becomes progressively more excitable. What factors contribute to the increase in excitability?
Correct Answer: B
Rationale: The correct answer is B: Progesterone synthesis by the placenta decreases. Progesterone maintains uterine quiescence during pregnancy by inhibiting uterine contractions. As progesterone levels decline towards the end of pregnancy, the uterine muscle becomes more excitable. Placental estrogen synthesis (Choice A) does not directly affect uterine excitability. Uterine blood flow (Choice C) is not a direct factor in uterine muscle excitability. Prostaglandin E2 (Choice D) actually increases towards the end of pregnancy, contributing to uterine contractions rather than decreasing excitability.
Question 3 of 5
Levels of transcortin are elevated in a pregnant woman. Which of the following laboratory findings would be expected in this patient?
Correct Answer: A
Rationale: Rationale: Elevated levels of transcortin in a pregnant woman lead to an increase in total plasma cortisol concentration. Transcortin binds to cortisol, increasing its total concentration but reducing the amount of free (non-protein-bound) cortisol. Choice A is correct as total cortisol concentration increases due to transcortin binding. Choices B and D are incorrect as free cortisol concentration decreases. Choice C is incorrect as total cortisol concentration is elevated, not decreased.
Question 4 of 5
The gonads, or primary sex organs, produce sex cells, also known as ________.
Correct Answer: C
Rationale: The correct answer is C: gametes. Gonads produce sex cells, which are haploid cells involved in reproduction. Gametes are the mature, haploid male or female germ cells (sperm or egg) produced by the gonads. Zygotes are formed when gametes fuse during fertilization, not produced by gonads. Interstitial cells are found in the testes and produce hormones, not sex cells. Spermatids are immature male germ cells that develop into sperm, not the primary sex cells produced by gonads.
Question 5 of 5
Which hormone promotes a small number of primary follicles within the ovary to grow and mature each month?
Correct Answer: D
Rationale: The correct answer is D, follicle-stimulating hormone (FSH). FSH promotes the growth and maturation of primary follicles in the ovary each month. It stimulates the follicles to develop and produce estrogen. LH surge triggers ovulation. A and B are involved in the menstrual cycle, but they do not specifically promote the growth of primary follicles. C is not a hormone involved in the process.