An increase from pH 7.2 to pH 7.4 around hemoglobin causes:

1. hemoglobin to release all bound oxygen molecules.
2. an increase in the affinity of hemoglobin to bind oxygen molecules.
3. hemoglobin to denature.
4. an increase in the binding of H+ by hemoglobin.

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
 76%
From NCERT
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Increased asthmatic attacks in certain seasons are related to:

1. hot and humid environment

2. eating fruits preserved in tin containers

3. inhalation of seasonal pollen

4. low-temperature 

Subtopic:  Respiratory Disorders: Part 1 | Respiratory Disorders: Part 2 |
 84%
AIPMT - 2007
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The 'blue baby' syndrome results from:

1. excess of chloride

2. methaemoglobin

3. excess of dissolved oxygen

4. excess of TDS (Total Dissolved Solids)

Subtopic:  Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 60%
AIPMT - 2006
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The majority of carbon dioxide produced by our body cells is transported to the lungs:

1. dissolved in the blood

2. as bicarbonates

3. as carbonates

4. attached to haemoglobin

Subtopic:  Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 91%
From NCERT
AIPMT - 2006
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Pneumotaxic centre which can moderate the functions of the respiratory rhythm centre is present at:

1. Pons region in brain

2. Thalamus

3. Spinal cord

4. Right cerebral hemisphere

Subtopic:  Respiratory System: Regulation of Respiration |
 94%
From NCERT
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Haemoglobin is:

1. An oxygen carrier in human blood

2. A protein used as a food supplement

3. An oxygen scavenger in root nodules

4. A plant protein with high lysine content

Subtopic:  Respiratory System: Transport of Gases |
 92%
From NCERT
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The exchange of gases in the alveoli of the lungs takes place by:

1. osmosis

2. simple diffusion

3. passive transport

4. active transport

Subtopic:  Respiratory System: Exchange of Gases |
 88%
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Dead space air in man is:

1. 500 mL

2. 150 mL

3. 250 mL

4. 1.5 L

Subtopic:  Respiratory System: Pulmonary Volumes & Capacities |
 72%
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Amount of CO2 in expired air is about:

1. 0.04%

2. 0.03%

3. 4.5%

4. 21%

Subtopic:  Respiratory System: Transport of Gases |
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What is another name for the windpipe?

1. Trachea

2. Larynx

3. Oesophagus

4. Lungs

Subtopic:  Respiratory System: Trachea & Basic Anatomy of Lung |
 77%
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