Question

c. Mention the parts that bring about an exchange of respiratory gase
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Answer 1

Explanation:

The part starting with the external nostrils up to the terminal bronchioles constitute the conducting part whereas the alveoli and their ducts form the respiratory or exchange part of the respiratory system

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Answer 2

The part starting with the external nostrils up to the terminal bronchioles constitute the conducting part whereas the alveoli and their ducts form the respiratory or exchange part of the respiratory system.

Respiration involves the following steps:

(i) Breathing or pulmonary ventilation by which atmospheric air  is drawn in and CO₂ rich alveolar air is released out.

(ii) Diffusion of gases (O₂ and CO₂ ) across alveolar membrane.

(iii) Transport of gases by the blood.

(iv) Diffusion of O₂ and CO₂ between blood and tissues.

(v) Utilisation of O₂  by the cells for catabolic reactions and resultant  release of CO₂.