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Breathing and Exchange of Gases · Question 18

NEET (UG) 2020MCQMedium📈 Topic in 38% papers+4−1
1

Identify the wrong statement with reference to transport of oxygen.

  1. Binding of oxygen with haemoglobin is mainly related to partial pressure of O2
  2. Partial pressure of CO2 can interfere with O2 binding with haemoglobin
  3. Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin
  4. Low pCO2 in alveoli favours the formation of oxyhaemoglobin

Answer

(3) Higher H+ conc. in alveoli favours the formation of oxyhaemoglobin

Solution

As per NCERT, binding of oxygen with haemoglobin is primarily related to partial pressure of O2; partial pressure of CO2, hydrogen ion concentration and temperature can also interfere with this binding.

⇒ In the alveoli: high pO2, low pCO2, lesser H+ concentration and lower temperature favour the formation of oxyhaemoglobin.

⇒ In the tissues: low pO2, high pCO2, high H+ concentration and higher temperature favour dissociation of oxygen from oxyhaemoglobin.

∴ Statement (3) is wrong — a higher H+ concentration favours dissociation, not formation, of oxyhaemoglobin.

Answer: (3)

NEET (UG) 2020

Keep practising — Breathing and Exchange of Gases

2

Tidal Volume and Expiratory Reserve Volume of an athlete is 500 mL and 1000 mL respectively. What will be his Expiratory Capacity if the Residual Volume is 1200 mL?

  1. 2200 mL
  2. 2700 mL
  3. 1500 mL
  4. 1700 mL
NEET (UG) 2019
3

Due to increasing air-borne allergens and pollutants, many people in urban areas are suffering from respiratory disorder causing wheezing due to :

  1. Proliferation of fibrous tissues and damage of the alveolar walls
  2. Reduction in the secretion of surfactants by pneumocytes
  3. Benign growth on mucous lining of nasal cavity
  4. Inflammation of bronchi and bronchioles
Out of syllabusNEET (UG) 2019
4

Which of the following options correctly represents the lung conditions in asthma and emphysema, respectively?

  1. Decreased respiratory surface; Inflammation of bronchioles
  2. Inflammation of bronchioles; Decreased respiratory surface
  3. Increased number of bronchioles; Increased respiratory surface
  4. Increased respiratory surface; Inflammation of bronchioles
NEET 2018
5

Match the items given in column I with those in column II and select the correct option given below.

  1. (a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)
  2. (a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)
  3. (a)-(iii), (b)-(ii), (c)-(i), (d)-(iv)
  4. (a)-(i), (b)-(iv), (c)-(ii), (d)-(iii)
NEET 2018
6

Which of the following is an occupational respiratory disorder?

  1. Botulism
  2. Anthracis
  3. Silicosis
  4. Emphysema
NEET 2018
7

Lungs are made up of air-filled sacs, the alveoli. They do not collapse even after forceful expiration, because of

  1. inspiratory reserve volume
  2. tidal volume
  3. expiratory reserve volume
  4. residual volume.
NEET 2017
8

Reduction in pH of blood will

  1. decrease the affinity of haemoglobin with oxygen
  2. release bicarbonate ions by the liver
  3. reduce the rate of heart beat
  4. reduce the blood supply to the brain.
NEET 2016 (Phase 1)
9

Name the chronic respiratory disorder caused mainly by cigarette smoking.

  1. Respiratory acidosis
  2. Respiratory alkalosis
  3. Emphysema
  4. Asthma
NEET 2016 (Phase 1)
10

Asthma may be attributed to

  1. inflammation of the trachea
  2. accumulation of fluid in the lungs
  3. bacterial infection of the lungs
  4. allergic reaction of the mast cells in the lungs.
NEET 2016 (Phase 1)
11

The partial pressure of oxygen in the alveoli of the lungs is

  1. equal to that in the blood
  2. more than that in the blood
  3. less than that in the blood
  4. less than that of carbon dioxide.
NEET 2016 (Phase 2)

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