Question

The lung contracts and expands how many times a minute?

Answer 1

72 times in a minute.
I hope not sure..

Answer 2

hello friend

Lung never contract and expand itself.
Lung expand and contract with the help of breathing and the process of inhale and exhale.

It totally depends on breathing but not the same time as compare to our breathing.

lung expand and contract less than the numbers of breathing.

I think 25 to 30 times in minute