During expiration which of the following events takes place
(1)Diaphragm and external intercostal muscles contracts

(2) Diaphragm and external intercostal muscles relax

(3)Inter Pleural pressure is less than atmospheric pressure

(4)Both A and C

Subtopic:  Respiratory System: Pulmonary Ventilation |
 81%
From NCERT
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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

Subtopic:  Respiratory System: Pulmonary Ventilation |
 93%
From NCERT
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Which of the following is true for inspiration
(1)thoracic chamber volume increases

(2)Diaphragm contracts

(3)pulmonary volume increases

(4)All of these

Subtopic:  Respiratory System: Pulmonary Ventilation |
 95%
From NCERT
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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

Subtopic:  Respiratory System: Pulmonary Ventilation |
 75%
From NCERT
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Pressure gradient between the lungs and atmosphere is maintained by
(1)diaphragm

(2)external intercostal muscles

(3)internal intercostal muscles

(4)All of these

Subtopic:  Respiratory System: Pulmonary Ventilation |
 92%
From NCERT
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The volume of air involved in breathing movements can be estimated by using
1. ECG
2. Sphygmomanometer
3. spirometer
4. Barometer

Subtopic:  Respiratory System: Pulmonary Ventilation |
 90%
From NCERT
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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

Subtopic:  Respiratory System: Exchange of Gases |
 97%
From NCERT
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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

Subtopic:  Respiratory System: Exchange of Gases |
 97%
From NCERT
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On an average, a healthy human breathes ______times/minute.
1. 70-72
2. 20-25
3. 12-16
4. 120-80

Subtopic:  Respiratory System: Pulmonary Ventilation |
 81%
From NCERT
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On an average, a human child breathes ______times/minute.
(1)70-72

(2)24-27

(3)12-16

(4)120-80

Subtopic:  Respiratory System: Pulmonary Ventilation |
 63%
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