How many ribs are indirectly attached to sternum ?

When there is no air in initial bronchioles, they do not collapse, it is due to :-

Assertion : Exchange part is the site of actual diffusion of O₂ and CO₂ between blood and atmospheri

Statement-I : During each cardiac cycle two prominent sounds are produced which can be easily heard

A symptom of acute chest pain appears when no enough oxygen is reaching the heart muscle, is called:

The maximum volume of air a person can breathe in after a forced expiration.