A : The passage starting with the external no | vedclass

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(D) The human respiratory system is divided into two parts: the conducting part and the respiratory part.$1$. The conducting part consists of the exte

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Both Assertion and Reason are incorrect.

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(D) The human respiratory system is divided into two parts: the conducting part and the respiratory part.$1$. The conducting part consists of the external nostrils,nasal passage,pharynx,larynx,trachea,bronchi,and terminal bronchioles.$2$. The function of the conducting part is to transport atmospheric air to the alveoli,clear it from foreign particles,humidify it,and bring it to body temperature.$3$. The respiratory part consists of the respiratory bronchioles,alveolar ducts,and alveoli,where the actual exchange of gases ($O_2$ and $CO_2$) takes place.$4$. Therefore,the Assertion is incorrect because the passage from external nostrils to terminal bronchioles is the conducting part,not the respiratory part.$5$. The Reason describes the functions of the conducting part,but since it labels the passage as the 'respiratory part',the Reason is also incorrect.

$A$ : The passage starting with the external nostrils up to the terminal bronchiole constitutes the respiratory part.
$R$ : The respiratory part transports the air to the alveoli,clears it from foreign materials,humidifies it,and brings the air to body temperature.

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$A$ : The passage starting with the external nostrils up to the terminal bronchiole constitutes the respiratory part.$R$ : The respiratory part transports the air to the alveoli,clears it from foreign materials,humidifies it,and brings the air to body temperature.