Which of the following is true for inspiration
(1)thoracic chamber volume increases
(2)Diaphragm contracts
(3)pulmonary volume increases
(4)All of these

Which of the following is true for expiration except
(1) thoracic chamber volume reduces
(2)Diaphragm contracts
(3)pulmonary volume decreases
(4)All of these

Pressure gradient between the lungs and atmosphere is maintained by
(1)diaphragm
(2)external intercostal muscles
(3)internal intercostal muscles
(4)All of these

Which of the following events happen when air enters lungs
(1)Ribs and sternum raised
(2)volume of thorax increased
(3)Diaphragm contracted
(4)All of the above

On an average, a healthy human breathes ______times/minute.
(1)70-72
(2)20-25
(3)12-16
(4)120-80

Which of the following volume of air cannot be measured by respirometer?
(1)IRV
(2)ERV
(3)RV
(4)Both A and B

Volume of air which does not participate in gaseous exchange is
(A)Residual volume
(B)Dead space air
(C)Tidal volume
(D)Both A and B

The volume of air expired normally after forceful inspiration
(1)TV+ IRV
(2)TV+ERV
(3)TV
(4)None of these

The volume of air expired forcefully after normal inspiration
(1) TV+ IRV
(2)TV+ERV
(3)TV
(4)None of these

Most of the aquatic arthropods respire through: