What is true about RBCs in humans?
 

1. They carry about 20-25 per cent of  CO2
2. They transport 99.5 per cent of O2
3. They transport about 80 per cent oxygen only and the rest 20 per cent of it is transported in dissolved state in blood plasma
4. They do not carry  CO2  at all

Subtopic:  Respiratory System: Transport of Gases Part 2 |
 82%
From NCERT
AIPMT - 2010
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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 |
 85%
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 |
 62%
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 |
 93%
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 |
 93%
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 |
 69%
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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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