Name the pulmonary disease in which alveolar surface area involved in gas exchange is drastically reduced due to damage in the alveolar walls.

1. Pleurisky

2. Emphysema

3. Pneumonia

4. Asthma

Subtopic:  Respiratory Disorders: Part 2 |
 89%
From NCERT
NEET - 2015
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When you hold your breath, which of the following gas changes in blood would first lead to the urge to breathe?
1. Falling O2 concentration
2. Rising CO2 concentration
3. Falling CO2 concentration
4. Rising CO2 and falling O2 concentration

Subtopic:  Respiratory System: Regulation of Respiration |
 61%
NEET - 2015
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Approximately seventy percent of carbon dioxide absorbed by the blood will be transported to the lungs:

1. as bicarbonate ions
2. in the form of dissolved gas molecules
3. by binding to R.B.C
4. as carbamino-haemoglobin
Subtopic:  Respiratory System: Transport of Gases Part 2 | Respiratory System: Transport of Gases |
 87%
From NCERT
AIPMT - 2014
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The figure shows a diagrammatic view of the human respiratory system with labels A, B, C, and D. Select the option that gives the correct identification, main function, and/or characteristics:

1. B-pleural membrane- surrounds ribs on both sides to provide cushion against rubbing.
2. C-alveoli-thin walled vascular bag-like structures for the exchange of gases.
3. D-lower end of the lungs-diaphragm pulls it down during inspiration.
4. A trachea-long tube supported by complete cartilaginous rings for conducting inspired air.

Subtopic:  Respiratory System: Trachea & Basic Anatomy of Lung |
 76%
From NCERT
AIPMT - 2013
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Which one of the following is the correct statement for respiration in humans?

1. Cigarette smoking may lead to inflammation of the bronchi
2. Neural signals from the pneumotaxic centre in the pons region of the brain can increase the duration of inspiration
3. Workers in grinding and stone-breaking industries may suffer from lung fibrosis
4. About 90% of carbon dioxide (CO2) is carried by haemoglobin as carbaminohaemoglobin

Subtopic:  Respiratory Disorders - III |
 78%
From NCERT
AIPMT - 2012
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Two friends are eating together at a dining table. One of them suddenly starts coughing while swallowing some food. This coughing would have been due to improper movement of:

1. diaphragm 2. neck
3. tongue 4. epiglottis
Subtopic:  Respiratory System: Trachea & Basic Anatomy of Lung |
 95%
From NCERT
AIPMT - 2011
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The figure given below shows a small part of the human lung where exchange of gases takes place. In which one of the options given below, the one part A, B, C or D is correctly identified along with its function?

    59000
1. A – Alveolar cavity – main site of exchange of respiratory gases
2. D – Capillary wall – exchange of Oand CO2 takes place here
3. B – Red blood cell –  transport of CO2 mainly.
4. C – Arterial capillary – passes oxygen to tissues
Subtopic:  Respiratory System: Exchange of Gases |
 81%
From NCERT
AIPMT - 2011
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A large proportion of oxygen is left unused in the human blood even after its uptake by body tissues. This O2:

1. raises the Pco2 blood to 75 mm of Hg

2. is enough to keep oxyhaemoglobin

3. helps in releasing more O2 to the epithelial tissues

4. acts as a reserve during muscular exercise

Subtopic:  Respiratory System: Transport of Gases Part 1 | Respiratory System: Transport of Gases |
 73%
AIPMT - 2011
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Listed below are four respiratory capacities (1-4) and four jumbled respiratory volumes of a normal human adult. 

Respiratory capacities Respiratory volume
(a) Residual volume 2500 mL
(b) Vital capacity 3500 mL
(c) Inspiratory reserve volume 1200 mL
(d) Inspiratory capacity 4500 mL


Which one of the following is the correct matching of two capacities and volumes?

1. (a) 2500 mL, (d) 4500 mL

2. (c) 1200 mL, (a) 2500 mL

3. (b) 4500 mL, (c) 2500 mL

4. (d) 4500 mL, (b) 3500 mL

Subtopic:  Respiratory System: Pulmonary Volumes & Capacities |
 57%
From NCERT
AIPMT - 2010
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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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