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
The factor which does NOT affect the rate of alveolar diffusion is
(A) the thickness of the diffusion surface
(B) solubility of gases like O₂ and CO₂
(C) pressure gradients of O₂ and CO₂
(D) reactivity of the gases.
Option d – reactivity of the gases.
Read the following statements about the structures of conducting part of the respiratory system and choose the correct option. i. The conducting part of the respiratory starts with the external nostrils and the system ends at the trachea. ii. They humidify the air. iii. They warm the air up to the body temperature. iv. They clear the air of foreign particles.
(A) i, ii, iv are correct
(B) ii, iii, iv are correct
(C) only ii and iii are correct
(D) All the statements are correct
Option b – ii, iii, iv are correct
What is the percentage of CO₂ carried in a dissolved state through plasma in humans?
(A) 7
(B) 97
(C) 25
(D) 20
Option a – 7
…….. is used in the clinical assessment of pulmonary functions.
(A) Sphygmomanometer
(B) Sphaerometer
(C) Spirometer
(D) Spectrophotometer
Option c – Spirometer
Asthma is a condition caused due to
(A) inflammation of the trachea
(B) accumulation of fluid in the lungs
(C) bacterial infection of the lungs
(D) inflammation of bronchi and bronchioles
Option d – inflammation of bronchi and bronchioles
On average, a healthy human breathes
(A) 8-10 times/minute
(B) 12- 16 times/minute
(C) 20-25 times/minute
(D) more than 20 times/minute
Option b – 12- 16 times/minute
Which of the following statements is NOT true?
(A) The partial pressure of 0₂ in deoxygenated blood is 40 mm Hg.
(B) The partial pressure of O₂ in oxygenated blood is 95 mm Hg.
(C) The partial pressure of O₂ in alveolar air is 104 mm Hg.
(D) The partial pressure of O₂ in tissues is 95 mm Hg.
Option d – The partial pressure of O₂ in tissues is 95 mm Hg
Statement I: Carbonic anhydrase facilitates the conversion of CO₂ and H₂O to H₂CO3 in RBCs. Statement II: RBCs contain a very high concentration of the enzyme, carbonic anhydrase. The correct statement/s is/are
(A) Statement I only
(B) Statement II only
(C) Both statements I and II
(D) Neither statement I nor II
Option c – Both statements I and II
Which of the following sequence is CORRECT to initiate inspiration? i. The contraction of external intercostal muscles raises the ribs and sternum. ii. The volume of the thorax increases in the dorso ventral axis. iii. Intrapulmonary pressure decreases. iv. Contraction of the diaphragm. V. Air rushes into the lungs. vi. The volume of the thorax increase in the anterior-posterior axis. vii. Pulmonary volume increases.
(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
CO₂ is carried by hemoglobin as
(A) Oxyhaemoglobin.
(B) Leghaemoglobin
(C) Carbamino-haemoglobin
(D) Legoglobin
Option c – Carbamino-haemoglobin
Which of the following is NOT a step in respiration in humans?
(A) Alveolar diffusion of O₂ and CO2
(B) Transport of gases by the blood
(C) Diffusion of O₂ and CO₂ between blood and tissues
(D) Utilization of CO₂ by cells for catabolic reactions
Option d – Utilization of CO₂ by cells for catabolic reactions
Assertion: Inspiration occurs when there is a negative pressure in the lungs with respect to atmospheric pressure. Reason: During inspiration, a decrease in pulmonary volume increases the intra-pulmonary pressure more than atmospheric pressure which forces the air from outside to move into the lungs.
(A) Both assertion and reason are true and the reason is the correct explanation of assertion.
(B) Both assertion and reason are true but the reason is not the correct explanation of assertion.
(C) The assertion is true but the reason is false.
(D) Both assertion and reason are false.
Option c – The assertion is true but the reason is false.
The expiratory reserve volume is
(A) 1000 mL to 1100 mL
(B) 4000 mL to 4500 mL
(C) 2000 mL to 3000 mL
(D) 5000 mL to 6500 mL
Option a – 1000 mL to 1100 mL
The alveoli of the lungs are lined by
(A) Cuboidal epithelium
(B) Squamous epithelium
(C) Glandular epithelium
(D) Columnar epithelium
Option b – Squamous epithelium
Inspiratory reserve volume is
(A) 1000-1100 mL
(B) 6000-8000 mL
(C) 2500-3000 mL
(D) 4000-5000 mL
Option c – 2500-3000 mL
Carbon dioxide is transported via the blood to the lungs mostly
(A) as bicarbonate
(B) in the form of carbonic acid only
(C) in combination with hemoglobin only
(D) as carbamino-hemoglobin
Option a – as bicarbonate
The exchange of gases (O₂ and CO₂) in mammals takes place in
(A) trachea
(B) larynx
(C) diaphragm
(D) alveoli
Option d – alveoli
The partial pressure of oxygen and carbon dioxide in tissues is ……. and …….. respectively.
(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
Inspiratory air in the lungs ultimately reaches
(A) trachea
(B) alveoli
(C) bronchi
(D) glottis
Option b – alveoli
Expiration occurs when
(A) intra-pulmonary pressure is higher than atmospheric pressure.
(B) intra-pulmonary pressure is lesser than atmospheric pressure.
(C) diaphragm and intercostal muscles contract.
(D) contraction of intercostal muscles and relaxation of the diaphragm.
Option a – intra-pulmonary pressure is higher than atmospheric pressure.
Total lung capacity is equal to
(A) RV+ERV+TV+IRV
(A) (B) VC+RV
(C) FRC+IC
(D) all of these
Option d – all of these
…….. curve is obtained when the percentage saturation of hemoglobin with O, is plotted against the pO₂.
(A) J-shaped
(B) Sigmoid
(C) Elliptical
(D) Parabolic
Option b – Sigmoid
Which one of the following is the CORRECT statement for respiration in humans?
(A) Emphysema is a respiratory disorder in which alveolar walls are damaged.
(B) Neural signals from the pneumotaxic center in the pons region of the brain can increase the duration of inspiration.
(C) At the alveolar level, CO₂ is trapped as carboxyhemoglobin.
(D) About 90% of CO₂ is carried by hemoglobin as carbamino-hemoglobin.
Option a – Emphysema is a respiratory disorder in which alveolar walls are damaged.
We covered all the breathing and exchange of gases MCQ for neet above in this post for free so that you can practice well for the exam.
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