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Breathing and Exchange of Gases · Question 17

NEET (UG) 2020MCQEasy📈 Topic in 0% papers+4−1
1

Select the correct events that occur during inspiration.

  1. Only (iv)
  2. (iii) and (iv)
  3. (i), (ii) and (iv)
  4. (i) and (ii)

Answer

(4) (i) and (ii)

Solution

As per NCERT, inspiration is initiated by the contraction of the diaphragm, which increases the volume of the thoracic chamber in the antero-posterior axis.

⇒ Contraction of the external inter-costal muscles lifts the ribs and sternum, increasing the volume in the dorso-ventral axis.

⇒ The increase in thoracic volume causes a similar increase in pulmonary volume.

∴ Intra-pulmonary pressure decreases to less than atmospheric pressure and air moves into the lungs.

Hence (i) and (ii) are correct; (iii) and (iv) are wrong (pulmonary volume increases and intra-pulmonary pressure decreases).

Answer: (4)

NEET (UG) 2020

Keep practising — Breathing and Exchange of Gases

2

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
NEET (UG) 2020
3

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
4

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
5

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
6

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
7

Which of the following is an occupational respiratory disorder?

  1. Botulism
  2. Anthracis
  3. Silicosis
  4. Emphysema
NEET 2018
8

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
9

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)
10

Name the chronic respiratory disorder caused mainly by cigarette smoking.

  1. Respiratory acidosis
  2. Respiratory alkalosis
  3. Emphysema
  4. Asthma
NEET 2016 (Phase 1)
11

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)

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