Breathing And Exchange Of Gases — DPP 3

20 NEET questions from Breathing And Exchange Of Gases, with answers and explanations. Attempt it as a timed test to get scoring, accuracy breakdown and mistake tracking.

Attempt this test free 20 questions · 30 minutes · +80 marks
1
How many major layers constitute diffusion membrane?
  1. A 3
  2. B 4
  3. C 2
  4. D 1
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Correct answer: A

2
The partial pressure of oxygen is equal in;
  1. A atmospheric air and alveoli.
  2. B alveoli and oxygenated blood.
  3. C tissues and deoxygenated blood.
  4. D deoxygenated blood and alveoli.
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Correct answer: C

3
With decrease in temperature, oxyhaemoglobin curve will become;
  1. A Straight
  2. B More steep
  3. C Parabola
  4. D All of these
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Correct answer: B

4
Wheezing due to inflammation of bronchi and bronchioles seen in;
  1. A Pneumonia
  2. B Asthma
  3. C Tuberculosis
  4. D Bronchitis
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Correct answer: B

5
The chemoreceptors that respond to changes in blood pH and carbon dioxide levels are located primarily in which two areas?
  1. A Aortic arch and carotid arteries
  2. B Cerebellum and midbrain
  3. C Spinal cord and thalamus
  4. D Nasal cavity and pharynx
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Correct answer: A

6
Pneumotaxic centre present at _________ can moderate the functions of respiratory rhythm centre which is present in the _______ of brain.
  1. A pons region of brain, thalamus
  2. B pons region of brain, medulla oblongata
  3. C spinal cord, thalamus
  4. D spinal cord, medulla oblongata
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Correct answer: B

7
In humans, the respiratory control centres are located in the;
  1. A atria of heart.
  2. B outer pleural membrane of lungs.
  3. C Diaphragm and rib muscles.
  4. D Medulla oblongata of hindbrain.
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Correct answer: D

8
Alveoli become enlarged and damaged with reduced surface area in heavy smokers. The condition is called;
  1. A Silicosis
  2. B Emphysema
  3. C Asthma
  4. D Bronchitis
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Correct answer: B

9
Partial pressures (in mmHg) of oxygen at alveoli and tissue is;
  1. A 159, 104
  2. B 0.3, 40
  3. C 95, 40
  4. D 104, 40
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Correct answer: D

10
Direction of concentration gradient for oxygen is from;
  1. A tissues to blood and blood to alveoli.
  2. B blood to tissues and tissues to alveoli.
  3. C alveoli to blood and blood to tissues.
  4. D tissues to alveoli and alveoli to tissue.
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Correct answer: C

11
How much time solubility of oxygen is lesser than the carbon dioxide across the respiratory membrane?
  1. A 20 - 25
  2. B 25 - 50
  3. C 120 - 125
  4. D 220 - 225
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Correct answer: A

12
Which of the following animals primarily relies on simple diffusion for gas exchange?
  1. A Molluses
  2. B Fish
  3. C Sponge
  4. D Insect
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Correct answer: C

13
Total lung capacity is approximately;
  1. A 1200 ml
  2. B 2400 ml
  3. C 4000 ml
  4. D 5800 ml
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Correct answer: D

14
When you exhale, the diaphragm;
  1. A relaxes and arches.
  2. B relaxes and flattens.
  3. C contracts and arches.
  4. D contracts and flattens.
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Correct answer: A

15
During inspiration;
  1. A diaphragm and external intercostal muscles relax.
  2. B diaphragm and internal intercostal muscles relax.
  3. C diaphragm and external intercostal muscles contract.
  4. D diaphragm and internal intercostal muscles contract.
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Correct answer: C

16
Assertion (A): Low partial pressure of oxygen allow formation of oxyhaemoglobin.
Reason (R): CO has high affinity with haemoglobin as compared to oxygen.
  1. A Both assertion (A) and reason (R) are true and the reason is the correct explanation of assertion.
  2. B Both assertion (A) and reason (R) are true but the reason is not the correct explanation of the assertion.
  3. C Assertion (A) is true and the reason (R) is false.
  4. D Assertion (A) is false and the reason (R) is true.
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Correct answer: D

17
Diaphragm contract during inspiration becomes;
  1. A Flat
  2. B Dome shaped
  3. C Concave
  4. D Rotate
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Correct answer: A

18
The nasal chamber opens into the;
  1. A larynx
  2. B pharynx
  3. C trachea
  4. D nostrils
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Correct answer: B

19
After adding inspiratory capacity and functional residual capacity, if we subtract residual volume then we obtain;
  1. A inspiratory reserve volume.
  2. B expiratory reserve volume.
  3. C expiratory capacity.
  4. D vital capacity.
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Correct answer: D

20
Which of the following structures is supported by incomplete cartilaginous rings?
  1. A Alveoli
  2. B Terminal bronchioles
  3. C Primary, secondary and tertiary bronchi
  4. D Pharynx
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Correct answer: C

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