In a minute, a normal healthy human adult respires: (in $\times$)

The ventilation movements of the lungs in mammals are governed by:

In mammals,the ventilation movements of the lungs are governed by:

The breathing rate of a normal healthy man is

Due to the presence of which structure is the pulmonary ventilation system in humans better developed than in reptiles and birds?

Assertion : Inspiration occurs due to muscular relaxation.
Reason : During inspiration,the diaphragm and external intercostal muscle contract simultaneously.