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Breathing and Exchange of Gases · Question 9

RE-NEET (UG) 2024MCQEasy📈 Topic in 38% papers+4−1
1

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R. In the light of the above statements, choose the correct answer from the options given below.

  1. A is true but R is false.
  2. A is false but R is true.
  3. Both A and R are true and R is the correct explanation of A.
  4. Both A and R are true but R is NOT the correct explanation of A

Answer

(3) Both A and R are true and R is the correct explanation of A.

Solution

Assertion: Nearly 20–25 per cent of CO2 is transported by RBCs (haemoglobin) as carbamino-haemoglobin, whereas about 70 per cent is carried as bicarbonate. True.

Reason: Binding of CO2 with haemoglobin is related to the partial pressure of CO2; pO2 is a major factor affecting this binding. When pCO2 is high and pO2 is low, as in the tissues, more binding of CO2 occurs. True, and it explains how carbamino-haemoglobin is formed in the tissues.

Answer: (3)

RE-NEET (UG) 2024

Keep practising — Breathing and Exchange of Gases

2

Vital capacity of lung is .

  1. IRV + ERV + TV + RV
  2. IRV + ERV + TV − RV
  3. IRV + ERV + TV
  4. IRV + ERV
NEET (UG) 2023
3

Under normal physiological conditions in human beings every 100 ml of oxygenated blood can deliver ml of O2 to the tissues.

  1. 2 ml
  2. 5 ml
  3. 4 ml
  4. 10 ml
NEET (UG) 2022
4

Which of the following is not the function of conducting part of respiratory system?

  1. It clears inhaled air from foreign particles
  2. Inhaled air is humidified
  3. Temperature of inhaled air is brought to body temperature
  4. Provides surface for diffusion of O2 and CO2
NEET (UG) 2022
5

Identify the region of human brain which has pneumotaxic centre that alters respiratory rate by reducing the duration of inspiration.

  1. Cerebrum
  2. Medulla
  3. Pons
  4. Thalamus
NEET (UG) 2022 (Phase 2)
6

Which of the following statements are correct with respect to vital capacity? Choose the most appropriate answer from the options given below :

  1. A and E only
  2. B, D and E only
  3. A, C and D only
  4. A, C and E only
NEET (UG) 2022 (Phase 2)
7

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

  1. Low pO2, low pCO2, more H+, higher temperature
  2. High pO2, low pCO2, less H+, lower temperature
  3. Low pO2, high pCO2, more H+, higher temperature
  4. High pO2, high pCO2, less H+, higher temperature.
NEET (UG) 2021
8

The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are :

  1. pO2 = 159 and pCO2 = 0.3
  2. pO2 = 104 and pCO2 = 40
  3. pO2 = 40 and pCO2 = 45
  4. pO2 = 95 and pCO2 = 40
NEET (UG) 2021
9

Select the correct events that occur during inspiration.

  1. Only (iv)
  2. (iii) and (iv)
  3. (i), (ii) and (iv)
  4. (i) and (ii)
NEET (UG) 2020
10

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
11

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

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