Question

When during fetal development do rhythmic breathing movements begin?

1) late in the third trimester
2) early in the second trimester
3) when contractions begin
4) just after fertilization

Answer 1

Fetal breathing movements begin around week 20 or 21 of development and help prepare the fetus for breathing after birth. These movements are a sign of good health and contribute to the formation and maturation of the alveoli.

Step-by-step explanation:

Fetal breathing movements begin around week 20 or 21 of development. These movements involve muscle contractions that cause the inhalation and exhalation of amniotic fluid, helping to tone the muscles in preparation for breathing after birth. Fetal breathing movements are considered a sign of good health and may also contribute to the formation and maturation of the alveoli.