Question

In which trimester does the following occur? The respiratory system becomes mature. first second third

Answer 1

The respiratory system becomes mature in the third trimester, with critical development occurring from week 24 until birth, enabling sufficient alveolar maturation by week 28 for premature breathing.

Step-by-step explanation:

The respiratory system becomes mature in the third trimester of pregnancy. Development of the respiratory system starts as early as 4 weeks of gestation with major growth and maturation happening from week 24 until term. By week 28, the alveoli have developed enough that a baby, if born prematurely, can typically breathe on their own. However, the respiratory system is not fully developed until early childhood, as a full complement of mature alveoli is present by around 8 years of age.

Answer 2

Answer is third trimester.

The development of respiratory system starts early in the fetus. It begins at the 4 week of pregnancy. The respiratory system matures by week 28 (third trimester). By that time enough alveoli get matured so the even baby delivered immature, can breathe its own. However, respiratory system fully matured during early childhood.