Hypoplastic left heart syndrome is characterized by underdevelopment of

Correct Answer: D

Rationale: Rationale: 1. Hypoplastic left heart syndrome involves underdevelopment of the left ventricle, aortic valve, and aortic arch. 2. The left ventricle is essential for pumping oxygenated blood to the body. 3. Aortic valve controls blood flow from the left ventricle to the aorta. 4. Aortic arch connects the ascending and descending aorta. Summary: A - Incorrect, as it includes pulmonary veins not related to hypoplastic left heart syndrome. B - Incorrect, as it includes structures not primarily affected in this condition. C - Incorrect, as it does not involve structures related to the left side of the heart.

Correct Answer: C

Rationale: The correct answer is C because radiation and substances of abuse are known teratogenic causes of congenital abnormalities. Radiation exposure can lead to genetic mutations and developmental issues in the fetus. Substances of abuse like alcohol, tobacco, and illicit drugs can also negatively impact fetal development. A: Medical conditions and pesticides may have negative effects on pregnancy outcomes, but they are not typically classified as teratogenic causes of congenital abnormalities. B: Prescription drugs can be teratogenic in some cases, but not all prescription drugs have harmful effects on fetal development. Chromosomes are not typically considered teratogenic causes. D: Disordered genes can lead to congenital abnormalities, but they are not classified as teratogenic causes. Medical conditions are not universally teratogenic.

Correct Answer: B

Rationale: It is important to monitor blood pressure in pregnant women to detect preeclampsia, a serious condition that can lead to complications for both the mother and the baby. Preeclampsia is characterized by high blood pressure and protein in the urine, and early detection is crucial for timely intervention. Regular monitoring allows healthcare providers to identify and manage preeclampsia promptly, reducing the risk of severe complications such as eclampsia and organ damage. Anemia, preterm labor, and gestational diabetes are important aspects of prenatal care but are not directly related to the need for regular blood pressure monitoring in pregnant women.

Correct Answer: D

Rationale: The correct answer is D: All of the above. Multiple gestations are at higher risk for complications such as premature labor, where contractions start before 37 weeks, leading to preterm birth. Twin-to-twin transfusion syndrome can occur in identical twins sharing a placenta, causing unequal blood flow. Preeclampsia, characterized by high blood pressure and organ damage, is more common in multiple pregnancies. Therefore, all choices A, B, and C are correct as they are common complications associated with multiple gestations.

Correct Answer: D

Rationale: The correct answer is D, "All of the above." Postpartum hemorrhage can be caused by uterine atony, which is the failure of the uterus to contract after delivery; retained placenta, where parts of the placenta remain in the uterus; and vaginal trauma, such as tears or lacerations during delivery. Each of these factors can contribute to excessive bleeding after childbirth. Therefore, selecting all the choices is necessary to encompass the main causes of postpartum hemorrhage.