During inspiration there is __________pressure in the lungs with respect to atmospheric pressure.
(1)positive
(2)negative
(3)neither positive nor negative
(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
The volume of air involved in breathing movements can be estimated by using
1. ECG
2. Sphygmomanometer
3. spirometer
4. Barometer
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
Which of the following events happen when air expelled from lungs
1. Ribs and sternum returned to original position
2. volume of thorax decreased
3. Diaphragm relaxed and arched upwards
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
The volume of air expired forcefully after normal inspiration
1. TV+ IRV
2.TV+ERV
3.TV
4. None of these
The volume of air expired forcefully after forceful inspiration
(1)TV+ IRV
(2)TV+ERV+IRV
(3)TV+ERV+IRV+RV
(4)None of these
The partial pressure of CO2 is minimum in the
1. atmospheric air
2. Alveoli
3. Deoxygenated blood
4. Oxygenated blood
Diffusion membrane consists of
1. Squamous epithelium of alveoli
2. endothelium of alveolar capillaries
3. Basement substance between them
4. All of the above