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Breathing and Exchange of Gases MCQs for NEET — Zoology Questions with Answers

Practice free Breathing and Exchange of Gases (Zoology) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.

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If the pneumotaxic center sends a strong neural signal, what would be the likely outcome on the respiratory rate?

A. Decrease in respiratory rate B. Increase in respiratory rate C. No change in respiratory rate D. Irregular breathing pattern

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Explanation

The neural signal from the pneumotaxic center 'can reduce the duration of inspiration and thereby alter the respiratory rate.' A reduction in inspiratory duration would lead to a more frequent cycle of breathing, thus increasing the respiratory rate.

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Neural regulation of respiration ensures that $\text{O}_2$ is continuously provided to the cells and $\text{CO}_2$ produced by the cells is released out. This process, involving exchange of gases between the atmosphere and cells, is commonly known as:

A. Digestion B. Respiration C. Circulation D. Excretion

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Explanation

The introductory part of the chapter mentions, 'This process of exchange of O2 from the atmosphere with CO2 produced by the cells is called breathing, commonly known as respiration.'

NEET 2023

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Vital capacity of lung is _____.

A. IRV + ERV B. IRV + ERV + TV + RV C. IRV + ERV + TV − RV D. IRV + ERV + TV

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Explanation

VC = IRV + TV + ERV (max air expired after max inspiration).

NEET 2024

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Match List I with List II:

List I	List II
A. Expiratory capacity	I. Expiratory reserve volume + Tidal volume + Inspiratory reserve volume
B. Functional residual capacity	II. Tidal volume + Expiratory reserve volume
C. Vital capacity	III. Tidal volume + Inspiratory reserve volume
D. Inspiratory capacity	IV. Expiratory reserve volume + Residual volume

Choose the correct answer from the options given below:

A. A-I, B-III, C-II, D-IV B. A-II, B-IV, C-I, D-III C. A-II, B-IV, C-I, D-III D. A-II, B-I, C-IV, D-III

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Explanation

EC = TV + ERV; FRC = ERV + RV; VC = IRV + TV + ERV; IC = TV + IRV.

NEET 2024

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Which of the following factors are favourable for the formation of oxyhaemoglobin in alveoli?

A. Low $pCO_2$ and High temperature B. High $pO_2$ and High $pCO_2$ C. High $pO_2$ and Lesser $H^+$ concentration D. Low $pCO_2$ and High $H^+$ concentration

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Explanation

High $pO_2$, low $pCO_2$, low $H^+$ (high pH) and low temperature shift the Hb-O₂ curve left, favouring oxyhaemoglobin formation in alveoli.

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