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Breathing and Exchange of Gases MCQ for NEET. We covered all the Breathing and Exchange of Gases MCQ for NEET in this post for free so that you can practice well for the exam.
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MCQ on Breathing and Exchange of Gases for NEET Students
Which of the following does not influence the rate of gas exchange in alveoli?
(A) Thickness of the respiratory membrane
(B) Solubility of oxygen and carbon dioxide
(C) Pressure differences of oxygen and carbon dioxide
(D) Chemical reactivity of the gases
Option d – Chemical reactivity of the gases
Consider the following about the conducting portion of the human respiratory system. Which option is correct?
i. It starts from the nostrils and ends at the trachea.
ii. It moistens incoming air.
iii. It increases the air temperature to match body temperature.
iv. It filters out dust and foreign substances.
(A) i, ii, and iv are correct
(B) ii, iii, and iv are correct
(C) Only ii and iii are correct
(D) All statements are correct
Option b – ii, iii, and iv are correct
What percentage of carbon dioxide in human blood is carried in dissolved form within plasma?
(A) 7
(B) 97
(C) 25
(D) 20
Option a – 7
Which instrument is commonly used to evaluate lung function in clinical settings?
(A) Sphygmomanometer
(B) Sphaerometer
(C) Spirometer
(D) Spectrophotometer
Option c – Spirometer
Asthma results from
(A) Inflammation of the trachea
(B) Fluid accumulation in the lungs
(C) Bacterial infection of lung tissues
(D) Inflammation of bronchi and bronchioles
Option d – Inflammation of bronchi and bronchioles
On average, how many breaths per minute does a healthy adult take?
(A) 8–10
(B) 12–16
(C) 20–25
(D) More than 20
Option b – 12–16
Which statement regarding partial pressure of oxygen is INCORRECT?
(A) In deoxygenated blood, it is 40 mm Hg
(B) In oxygenated blood, it is 95 mm Hg
(C) In alveolar air, it is 104 mm Hg
(D) In body tissues, it is 95 mm Hg
Option d – In body tissues, it is 95 mm Hg
Select the correct option regarding the enzyme carbonic anhydrase:
Statement I: It catalyzes the reaction between CO₂ and H₂O to form H₂CO₃ in red blood cells.
Statement II: It is present in very high concentrations within RBCs.
(A) Only Statement I is correct
(B) Only Statement II is correct
(C) Both statements are correct
(D) Neither statement is correct
Option c – Both statements are correct
Choose the correct sequence of events for the initiation of inhalation:
i. Ribs and sternum rise due to external intercostal contraction
ii. Thoracic volume increases along dorso-ventral axis
iii. Intrapulmonary pressure drops
iv. Diaphragm contracts
v. Air enters the lungs
vi. Thoracic volume expands in anterior-posterior axis
vii. Pulmonary volume rises
(A) vi, ii, iv, iii, vii, i, v
(B) iv, iii, i, vi, ii, vii, v
(C) vi, ii, i, iv, iii, vii, v
(D) iv, vi, i, ii, vii, iii, v
Option d – iv, vi, i, ii, vii, iii, v
Hemoglobin transports carbon dioxide in the form of
(A) Oxyhemoglobin
(B) Leghaemoglobin
(C) Carbaminohemoglobin
(D) Legoglobin
Option c – Carbaminohemoglobin
Which of the following is NOT a stage in human respiration?
(A) Diffusion of oxygen and carbon dioxide across alveolar membrane
(B) Circulation of gases through blood
(C) Exchange of gases between tissues and blood
(D) Utilization of carbon dioxide in cell metabolism
Option d – Utilization of carbon dioxide in cell metabolism
Assertion: Air flows into the lungs due to negative pressure within the lungs.
Reason: During inhalation, reduced pulmonary volume raises internal pressure above atmospheric pressure, pulling air in.
(A) Both assertion and reason are true, and the reason correctly explains the assertion
(B) Both assertion and reason are true, but the reason does not explain the assertion
(C) Assertion is true, but the reason is false
(D) Both assertion and reason are false
Option c – Assertion is true, but the reason is false
What is the normal range of expiratory reserve volume in humans?
(A) 1000–1100 mL
(B) 4000–4500 mL
(C) 2000–3000 mL
(D) 5000–6500 mL
Option a – 1000–1100 mL
The type of epithelium lining the alveolar walls is
(A) Cuboidal epithelium
(B) Squamous epithelium
(C) Glandular epithelium
(D) Columnar epithelium
Option b – Squamous epithelium
What is the typical volume of inspiratory reserve volume?
(A) 1000–1100 mL
(B) 6000–8000 mL
(C) 2500–3000 mL
(D) 4000–5000 mL
Option c – 2500–3000 mL
In the bloodstream, carbon dioxide is primarily carried as
(A) Bicarbonate ions
(B) Carbonic acid
(C) In combination with hemoglobin only
(D) Carbaminohemoglobin
Option a – Bicarbonate ions
Where does gas exchange primarily occur in mammals?
(A) Trachea
(B) Larynx
(C) Diaphragm
(D) Alveoli
Option d – Alveoli
What are the partial pressures of oxygen and carbon dioxide in body tissues?
(A) 45 mm Hg, 53 mm Hg
(B) 40 mm Hg, 45 mm Hg
(C) 95 mm Hg, 159 mm Hg
(D) 104 mm Hg, 40 mm Hg
Option b – 40 mm Hg, 45 mm Hg
Complete the analogy: Inspiratory capacity: TV + IRV :: ? : ERV + RV
(A) Functional residual capacity
(B) Vital capacity
(C) Residual volume
(D) Expiratory capacity
Option a – Functional residual capacity
Where does inspired air ultimately reach in the lungs?
(A) Trachea
(B) Alveoli
(C) Bronchi
(D) Glottis
Option b – Alveoli
When does exhalation take place?
(A) When intrapulmonary pressure exceeds atmospheric pressure
(B) When intrapulmonary pressure falls below atmospheric pressure
(C) When the diaphragm and intercostal muscles contract
(D) When intercostals contract and diaphragm relaxes
Option a – When intrapulmonary pressure exceeds atmospheric pressure
Total lung capacity can be defined as
(A) RV + ERV + TV + IRV
(B) VC + RV
(C) FRC + IC
(D) All of the above
Option d – All of the above
What shape is the curve formed by plotting hemoglobin saturation against partial pressure of oxygen?
(A) J-shaped
(B) Sigmoid
(C) Elliptical
(D) Parabolic
Option b – Sigmoid
Which of the following statements about human respiration is TRUE?
(A) Emphysema involves damage to alveolar walls
(B) The pneumotaxic center lengthens inspiration
(C) CO₂ binds as carboxyhemoglobin in alveoli
(D) Nearly 90% of CO₂ binds with hemoglobin as carbaminohemoglobin
Option a – Emphysema involves damage to alveolar walls
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