Nokea
The placenta allows exchange of oxygen, nutrients, and waste products between the mother and fetus by:
- A. Contact between maternal blood and fetal capillaries within the chorionic villi.
- B. Interaction of maternal and fetal pH levels within the endometrial vessels.
- C. A mixture of maternal and fetal blood within the intervillous spaces.
- D. Passive diffusion of maternal carbon dioxide and oxygen into the fetal capillaries.
Correct Answer: A
Rationale: Fetal capillaries within the chorionic villi are bathed with oxygen-rich and nutrient-rich maternal blood within the intervillous spaces.
You may also like to solve these questions
Along with gas exchange and nutrient transfer, the placenta produces many hormones necessary for normal pregnancy, including which of the following? (Select all that apply.)
- A. Insulin
- B. Estrogen
- C. Progesterone
- D. Testosterone
Correct Answer: B
Rationale: - Estrogen: The placenta secretes estrogen during pregnancy, which plays a crucial role in maintaining the pregnancy and preparing the body for childbirth. Estrogen helps regulate the menstrual cycle, supports fetal development, and stimulates the growth of the uterus and breasts.
The nurse is explaining fetal circulation to a student. Which statement by the nurse is correct?
- A. There is an opening between the atria that allows blood to flow directly to the lungs for oxygenation.
- B. There is a shunt between the aorta and the pulmonary vein that bypasses the lungs.
- C. The ductus arteriosus allows blood to flow from the pulmonary artery to the aorta.
- D. The foramen ovale closes just before birth.
Correct Answer: C
Rationale: The ductus arteriosus allows blood to bypass the lungs, directing it from the pulmonary artery to the aorta.
What is the most vulnerable time for teratogen exposure?
- A. 1-2 weeks after conception.
- B. 3-8 weeks after conception.
- C. 8-12 weeks after conception.
- D. The entire pregnancy.
Correct Answer: B
Rationale: The embryonic period (3-8 weeks) is when organogenesis occurs, making it highly sensitive to teratogens.
Match each term with its description. Zygote
- A. None
- B. None
- C. Part of the blastocyst that will develop into the embryo.
- D. None
Correct Answer: C
Rationale: Zygote develops into the embryo.
The ___ is/are responsible for oxygen and carbon dioxide transport to and from the maternal bloodstream.
- A. Decidua basalis.
- B. Blastocyst.
- C. Germ layer.
- D. Chorionic villi.
Correct Answer: D
Rationale: Chorionic villi obtain oxygen and nutrients from the maternal bloodstream and dispose of carbon dioxide and waste products into the maternal blood.