NEET Biology Breathing and Exchange of Gases MCQs Set 11

Multiple Choice Questions (MCQs) for NEET Biology: Breathing and Exchange of Gases

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Practice Breathing and Exchange of Gases MCQs for NEET Biology

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Multiple Choice Questions

Question 1: Which of the following is a common passage for food and air?
(a) External nostrils
(b) Oesophagus
(c) Trachea
(d) Pharynx
Show Answer & Explanation

Answer: (d) Pharynx

Explanation:
1. The pharynx is a common passage for food and air.

Teacher's Note:
1. The epiglottis prevents food entering the larynx.

Question 2: The primary, secondary and tertiary bronchi and initial bronchioles are supported by:
(a) Complete cartilaginous rings
(b) Incomplete cartilaginous rings
(c) Complete chitinous rings
(d) Incomplete chitinous rings
Show Answer & Explanation

Answer: (b) Incomplete cartilaginous rings

Explanation:
1. The trachea and bronchi are supported by incomplete cartilaginous rings which keep them open.

Teacher's Note:
1. Chitinous rings are found in insects.

Question 3: Which statement is true about the volume of the thoracic cavity?
(a) Contraction of the diaphragm increases volume dorso-ventrally
(b) Contraction of the diaphragm increases volume along the antero-posterior axis
(c) Contraction of EICM increases volume along the antero-posterior axis
(d) Contraction of IICM increases volume along the antero-posterior axis
Show Answer & Explanation

Answer: (b) Contraction of the diaphragm increases volume along the antero-posterior axis

Explanation:
1. The diaphragm flattens on contraction and increases the thoracic volume in the antero-posterior axis
2. External intercostals raise the ribs and increase the dorso-ventral axis.

Teacher's Note:
1. Inspiration needs both.

Question 4: We can increase the strength of expiration by contraction of which muscles? A. diaphragm B. EICM C. IICM D. abdominal muscles
(a) A, B, C and D
(b) A, C and D
(c) C and D
(d) A and D
Show Answer & Explanation

Answer: (c) C and D

Explanation:
1. Internal intercostal muscles and abdominal muscles contract in forced expiration.

Teacher's Note:
1. Normal expiration is passive.

Question 5: Which muscles help to increase the volume of the thoracic cavity?
(a) Diaphragm and EICM
(b) EICM and IICM
(c) Diaphragm and abdominal muscles
(d) IICM and abdominal muscles
Show Answer & Explanation

Answer: (a) Diaphragm and EICM

Explanation:
1. The diaphragm and external intercostal muscles contract during inspiration and enlarge the thorax.

Teacher's Note:
1. This lowers the intra-pulmonary pressure.

Question 6: Match. i. IRV ii. ERV iii. TV iv. RV; a. 1200 ml b. 1000 ml c. 2500 ml d. 500 ml
(a) i-c, ii-b, iii-d, iv-a
(b) i-a, ii-c, iii-d, iv-b
(c) i-b, ii-c, iii-a, iv-d
(d) i-d, ii-b, iii-d, iv-a
Show Answer & Explanation

Answer: (a) i-c, ii-b, iii-d, iv-a

Explanation:
1. Inspiratory reserve volume is about 2500-3000 ml, expiratory reserve about 1000-1100 ml, tidal volume 500 ml and residual volume about 1100-1200 ml.

Teacher's Note:
1. Vital capacity = IRV + TV + ERV.

Question 7: The total volume of air accommodated in the lungs at the end of a forced inspiration is the sum of:
(a) IRV + TV + ERV
(b) ERV + TV + RV + IRV
(c) TV + IRV
(d) IRV + TV + RV
Show Answer & Explanation

Answer: (b) ERV + TV + RV + IRV

Explanation:
1. Total lung capacity is the sum of all four volumes: ERV, TV, RV and IRV.

Teacher's Note:
1. It is about 5000-6000 ml.

Question 8: Which is the primary muscle of inspiration?
(a) Abdominal muscles
(b) Oblique muscles
(c) Intercostal muscles
(d) Diaphragm
Show Answer & Explanation

Answer: (d) Diaphragm

Explanation:
1. The diaphragm is the main muscle of inspiration.

Teacher's Note:
1. Intercostals assist it.

Question 9: The partial pressure of oxygen in alveolar air and in oxygenated blood respectively is:
(a) 40 mm Hg, 45 mm Hg
(b) 104 mm Hg, 95 mm Hg
(c) 159 mm Hg, 104 mm Hg
(d) 104 mm Hg, 40 mm Hg
Show Answer & Explanation

Answer: (b) 104 mm Hg, 95 mm Hg

Explanation:
1. Alveolar air has pO2 of about 104 mm Hg and oxygenated blood about 95 mm Hg.

Teacher's Note:
1. pO2 of atmospheric air is 159 mm Hg.

Question 10: Which statement is true?
(a) The alveolar wall is one cell thick
(b) The total thickness of the diffusion membrane is much less than a millimetre
(c) At the alveoli, gaseous exchange occurs by simple diffusion
(d) All of these
Show Answer & Explanation

Answer: (d) All of these

Explanation:
1. The thin alveolar wall (squamous epithelium) and capillary wall form a diffusion membrane under a millimetre thick, across which gases diffuse.

Teacher's Note:
1. Diffusion depends on partial pressure gradient.

Question 11: Which statement is correct?
(a) About 97 per cent of O2 is transported by RBCs in the blood
(b) About 90-93 per cent of CO2 is transported by RBCs
(c) About 7 per cent of O2 and 3 per cent of CO2 are carried dissolved in plasma
(d) More than one of the above are correct
Show Answer & Explanation

Answer: (a) About 97 per cent of O2 is transported by RBCs in the blood

Explanation:
1. About 97 per cent of O2 is carried by haemoglobin in RBCs and 3 per cent dissolved in plasma
2. About 20-25 per cent of CO2 is carried by RBCs and about 7 per cent dissolved.

Teacher's Note:
1. Most CO2 is carried as bicarbonate.

Question 12: The amount of O2 delivered by 100 ml of blood to the tissues under normal physiological conditions is:
(a) 200 ml
(b) 5 ml
(c) 1.34 ml
(d) 20 ml
Show Answer & Explanation

Answer: (b) 5 ml

Explanation:
1. Each 100 ml of oxygenated blood delivers about 5 ml of O2 to the tissues.

Teacher's Note:
1. It carries about 20 ml in total.

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Practice MCQs for NEET Biology Breathing and Exchange of Gases

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FAQs

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