How many ribs are indirectly attached to sternum ?

Choose the correct statement regarding the human respiratory system:

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

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