Question

multiple choice question
which of the following best describes the interaction of fetal and maternal blood systems?
o fetal and maternal blood only mix during the last trimester.
o fetal and maternal blood are separated by a placental membrane.
o fetal and maternal blood are separated by the yolk sac.
o fetal and maternal blood freely mixes in the chorionic cavity.

Explanation:

• The yolk sac is not involved in separating fetal and maternal blood.
• Fetal and maternal blood do not mix freely in the chorionic cavity.
• Fetal and maternal blood do not mix only during the last trimester.
• The placenta has a placental membrane that separates fetal and maternal blood while allowing for the exchange of nutrients, gases, and waste products.

Answer:

Fetal and maternal blood are separated by a placental membrane.