Correct Answer: B

Rationale: When a newborn is receiving phototherapy, it is important to avoid using lotions or ointments on their skin as these products can lead to skin irritation and burns under the phototherapy lights. Dressing the newborn in lightweight clothing helps ensure proper exposure to the phototherapy lights. Keeping the newborn supine during treatment helps maximize exposure to the light. However, the key consideration in this scenario is to prevent skin irritation and burns by avoiding lotions or ointments.

Correct Answer: A

Rationale: The correct answer is A, the amniotic sac. The amniotic sac is a fluid-filled structure that surrounds and protects the developing embryo and fetus in the uterus. It provides a cushion against external pressure, allows for movement and growth, and helps maintain a stable environment for the developing fetus. Choices B, C, and D are incorrect. The umbilical cord connects the fetus to the placenta and serves as a conduit for nutrients and waste; the neural tube is a structure that forms the central nervous system in early embryonic development; and the embryonic disk is a structure that forms during gastrulation, one of the early stages of embryonic development.

Correct Answer: D

Rationale: Polygenic traits, such as height and skin color, are determined by several pairs of genes working together. These traits are influenced by the combined effects of multiple genes across the genome, rather than being controlled by a single gene pair. Choices A, B, and C are incorrect because polygenic traits are not specifically developed during adolescence, transmitted by the mother, or uncommon in humans. Understanding polygenic traits is essential in genetics as they demonstrate the complexity of genetic inheritance and the influence of multiple genes on a single trait.

Correct Answer: A

Rationale: Uterine atony is significant hypotonia of the uterus and is the leading cause of postpartum hemorrhage. It results in the inability of the uterus to contract effectively after delivery, leading to excessive bleeding. Uterine inversion is a rare but serious complication that involves the turning inside out of the uterus, leading to hemorrhage, but it is not the most likely cause of profuse bleeding in this scenario. Vaginal hematoma may cause bleeding but is typically associated with pain as a primary symptom rather than profuse bleeding. Vaginal lacerations can cause bleeding, but in the presence of a firm, contracted uterine fundus, uterine atony is a more likely cause of ongoing profuse bleeding in the postpartum period.

Correct Answer: A

Rationale: The correct answer is A. Instructing the client to stay in a side-lying position after receiving misoprostol intravaginally is essential. This position helps keep the medication in place, allowing for better absorption. Choice B is incorrect because oxytocin administration is not typically indicated after misoprostol use. Choice C is incorrect as magnesium supplementation is not part of the standard protocol for misoprostol administration. Choice D is incorrect as having a full bladder is not necessary before initiating misoprostol therapy.