Question

In which trimester is the circulatory system fully functioning?

a. First trimester.
b. Second trimester.
c. Third trimester.
d. It is fully functioning throughout pregnancy.

Answer 1

The circulatory system in a fetus is fully functioning in the third trimester of pregnancy. During the first two trimesters, the fetus relies on three shunts to bypass and divert blood from undeveloped and partially functioning organs.

Step-by-step explanation:

The circulatory system in a fetus is fully functioning in the third trimester of pregnancy. During the first two trimesters, the fetus relies on three shunts to bypass and divert blood from undeveloped and partially functioning organs. These shunts help direct blood flow to and from the placenta. However, in the third trimester, the circulatory system of the fetus matures and operates independently, fully supporting the needs of the growing baby.