Which one of the following statements is incorrect ?

1. The residual air in lungs slightly decreases the efficiency of respiration in mammals

2. The presence of non-respiratory air sacs, increases the efficiency of respiration in birds

3. In insects, circulating body fluids serve to distribute oxygen to tissues

4. The principle of countercurrent flow facilitates efficient respiration in gills of fishes

Subtopic:  Respiratory System: Pulmonary Ventilation |
NEET - 2006
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In the tissues, high concentrations of carbon doxide

1. increases the affinity of haemoglobin to both oxygen and hydrogen

2. increases the affinity of haemoglobin to oxygen but decreases its affinity to hydrogen

3. decreases the affinity of haemoglobin to oxygen but increases its affinity to hydrogen

4. decreases the affinity of haemoglobin to both oxygen and hydrogen.

Subtopic:  Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 70%
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During winter a person died during sleep, the room was closed and a container with burnt

charcoal was found in the room. What may be the possible reason of his death?

1. non-availability of oxygen

2. Hb has more affinity to combine with carbon monoxide

3. Hb has more affinity to combine with nitrogen

4. combined effect of 1. and 3.

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 58%
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The respiratory centre in the brain is stimulated by

1. CO2 concentration in venous blood

2. O2 concentration in artery blood

3. CO2 concentration in artery blood

4. O2 concentration in venous blood.

Subtopic:  Respiratory System: Regulation of Respiration |
 61%
From NCERT
AIIMS - 2001
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Which of the following match is correct?

1. Emphysema : reduction of surface area of alveoli and bronchi

2. Pneumonia : occupational disease with asbestos

3. Silicosis : inflammation of alveoli

4. Asthma : excessive secretion of bronchial mucus

Subtopic:  Respiratory Disorders: Part 1 | Respiratory Disorders: Part 2 | Respiratory Disorders - III |
 75%
From NCERT
AIIMS - 2007
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When a man inhales air containing normal concentration of O2 as well as CO he suffers from suffocation because

(1) CO reacts with O2 reducing its percentage in air

(2) haemoglobin combines with CO instead of O2 and forms carboxyhaemoglobin

(3) CO affects diaphragm and intercostal muscles

(4) CO affects the nerves of the lungs.

Subtopic:  Respiratory System: Exchange of Gases |
 90%
AIIMS - 2008
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Respiration is controlled by

1. medulla oblongata

2. cerebellum

3. hypothalamus

4. cerebrum

Subtopic:  Respiratory System: Regulation of Respiration |
 93%
From NCERT
AIIMS - 2009
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Chemosensitive area of respiratory centre medulla is affected by

1. less CO2 and H+ ions

2. less O2 and H+ ions

3. excess CO2 and H+ ions

4. excess O2 and H+ ions.

Subtopic:  Respiratory System: Regulation of Respiration |
 86%
From NCERT
AIIMS - 2010
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Oxygen binding to haemoglobin in blood is

1. directly proportional to the concentration of CO2 in the medium

2. inversely proportional to the concentration of CO2 in the medium

3. directly proportional to the concentration of CO in the medium

4. independent of the concentration of CO in the medium.

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
 82%
From NCERT
AIIMS - 2012
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Carbon dioxide (CO2) diffuses into blood from tissue site and passes to alveolar site in the form of

1. bicarbonate; 70%

2. bicarbonate; 20 - 25%

3. carbaminohaemoglobin; 60 - 70%

4. carbaminohaemoglobin; 7%.

Subtopic:  Respiratory System: Transport of Gases Part 2 |
 82%
From NCERT
AIIMS - 2013
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