ATI RN
Anatomy Reproductive System Quizlet Questions
Question 1 of 5
Variations in eye color are determined by the number of pigmented cells in the:
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.
Question 2 of 5
After birth, the pressure in the pulmonary artery decreases greatly. What is the cause of this?
Correct Answer: D
Rationale: The correct answer is D: Pulmonary vascular resistance decreases. After birth, the lungs expand and start functioning, leading to increased oxygen levels, which causes the pulmonary vascular resistance to decrease. This allows blood flow to the lungs and decreases pressure in the pulmonary artery. A: Systemic arterial pressure increasing does not directly affect the pressure in the pulmonary artery. B: Ductus arteriosus closing is part of the normal postnatal changes but does not directly cause the decrease in pulmonary artery pressure. C: Left ventricular pressure increasing is a consequence of the closure of the ductus arteriosus but does not explain the decrease in pulmonary artery pressure.
Question 3 of 5
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?
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.
Question 4 of 5
Neonates that are kept in 100% oxygen incubators for several days become blind when they are removed from the incubator, a condition referred to as retrolental fibroplasia. What is the explanation for the loss of sight?
Correct Answer: C
Rationale: The correct answer is C because high oxygen concentration in neonates suppresses normal blood vessel growth in the retina. When oxygen therapy is stopped, oxygen levels fall, triggering excessive blood vessel growth in the retina and vitreous humor, leading to fibrous blockage of light. Option A suggests fibrous tissue growth due to oxygen, which is incorrect. Option B inaccurately states that oxygen causes vessel rupture. Option D is incorrect as oxygen does not directly destroy retinal neurons.
Question 5 of 5
In order for milk to flow from the nipple of the mother into the mouth of the nursing infant, which of the following must occur?
Correct Answer: C
Rationale: The correct answer is C because oxytocin is responsible for stimulating the contraction of myoepithelial cells around the alveoli in the mammary glands, causing milk ejection. This process is known as the let-down reflex. In contrast, choice A (myoepithelial cells must relax) is incorrect because they need to contract to push milk out. Choice B (prolactin levels must fall) is incorrect because prolactin is responsible for milk production, not milk ejection. Choice D (the baby's mouth must develop a strong negative pressure over the nipple) is incorrect because it is the mother's hormone release, not the baby's action, that causes milk flow.