A pregnant woman asks how the placenta supports the fetus. Which statement is correct?
Correct answer: A. It allows exchange of oxygen and nutrients across a barrier
- A. It allows exchange of oxygen and nutrients across a barrier
- B. It normally allows maternal and fetal blood to mix freely
- C. It produces all fetal blood cells throughout pregnancy
- D. It carries urine from the fetal bladder to the mother's kidneys
Explanation
The placenta permits exchange of oxygen, nutrients, and wastes between maternal and fetal circulations across placental tissue. Maternal and fetal blood normally remain separate, and fetal urine is removed through the fetal urinary system and amniotic fluid.
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About Reproductive System
The reproductive system covers the male and female reproductive organs, gamete formation, the menstrual and ovarian cycles, fertilization, implantation and pregnancy. It explains the roles of FSH, LH, oestrogen, progesterone and testosterone, while distinguishing spermatogenesis from oogenesis and the reproductive organs from the accessory glands.
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