Fill up the blanks in the following paragraph by selecting the correct option.
The movement of air into and out of the lungs is carried out by creating a (i).____ between the lungs and the atmosphere. Inspiration can occur if intra-pulmonary pressure is (ii).____ Expiration takes place when the intra-pulmonary pressure is (iii).____ than the atmospheric pressure. Expiration takes place when the intra-inspiration is initiated by the (iv).____ of diaphragm which (v).____the volume of thoracic chamber in the antero-posterior axis.

Options

A. `{:("(i)",(ii),(iii),(iv),(v)),("concentration gradient","less","higher","relaxation","increases"):}`
B. `{:("(i)",(ii),(iii),(iv),(v)),("concentration gradient","higher","less","contraction","decrease"):}`
C. `{:("(i)",(ii),(iii),(iv),(v)),("pressure gradient","higher","less","relaxation","decrease"):}`
D. `{:("(i)",(ii),(iii),(iv),(v)),("pressure gradient","less","higher","contraction","increase"):}`

Answer

D