Q. 21 - Biology

Question

Nutrient and waste requirements for the developing fetus are handled during the first few weeks by: a. the placenta b. diffusion through the endometrium c. the chorion d. the blastocyst 

Step-by-Step Solution

Answer

The correct option is b. diffusion through the endometrium 

Step 1. Given information

. As the trimester progresses, the outer layer of the embryo begins to merge with the endometrium, and the placenta forms. This organ takes over the nutrient and waste requirements of the embryo and fetus, with the mother’s blood passing nutrients to the placenta and removing waste from it. 

Step 2. Explanation

The correct option is b. diffusion through the endometrium ,

The gestation period is divided into three equal periods or trimesters. During the first two to four weeks of the first trimester, nutrition and waste are handled by the endometrial lining through diffusion.