Question

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

Answer 1

The respiratory system becomes mature Third trimester.

Step-by-step explanation:

The third trimester starts in week 28 of pregnancy and remains till you give birth, which may be about week 40 of reproduction. In other terms, your third trimester continues from month 7 to month 9 of reproduction. It’s possible, however, that activity will start several weeks ahead or following, in reality, around 30% of all newborns linger behind the 40-week point. If that's the problem, you can attempt a few methods to frequently effect labour on your private, but once you arrive week 42 of reproduction, you’ll be formally admitted late, at which limit your doctor will affect labour if it doesn’t start on its private.

Answer 2

third trimester

During the third trimester, the airspaces of most peripheral airways are mostly widened and lengthened, fibroblastic cells produce extracellular matrix, collagen and elastin and the vascular tree increases in diameter and length. These developments support epithelial differentiation and surfactant secretion. At week 32, the baby practices his breathing.