Question

Which extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus?

• A. Chorion
• B. Allantois
• C. Yolk sac
• D. Amnion

Answer 1

The correct option is D

Amnion

The correct option is D:

Explanation of the correct option :

1. Amniotic fluid fills the sac formed by the amnion.
2. The amniotic fluid protects the embryo from physical damage caused by mechanical shock by acting as a buffer.
3. By soaking the embryo, the amniotic fluid also helps to avoid dehydration and desiccation.

Explanation of the incorrect option:

Option A:

1. The chorion is the double membrane made up of trophoblast and extraembryonic mesoderm
2. It gives rise to the fetal component of the placenta.

Option B:

1. The allantois is an extra-embryonic membrane that develops as a pouch or sac from the hindgut in mammals.
2. It expands extensively between two additional membranes, the amnion, and chorion

Option C:

1. During early pregnancy, a tissue called a yolk sac grows inside the uterus.
2. It gives sustenance to an embryo.
3. It aids in the exchange of gases between the mother and the embryo.

Final Answer: Amnion extraembryonic membrane in humans prevents desiccation of the embryo inside the uterus.