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

Which of the following sequences is correct to initiate inspiration ? I. Intrapulmonary pressure dec

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

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