In the trachea _____ ‘C’ shaped cartilagenous rings are present.

Which one of the following does not consist diffusion membrane?

What percentage of carbon dioxide transport in the form of carbamino haemoglobin?

Oxygen dissociation curve will shift to right on decrease of________

Alveoli is derived from the__________

What is the primary site for exchange of gases in lungs?

Vital capacity = ____

Where is the respiratory rhythm center is located?