How is the air passing through the nostrils in humans is filtered?

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Solution

Respiratory Passage:
The respiratory pathway in humans begins from the nostrils of the nose and extends up to the alveoli in the lungs.
Nostrils in the nose:
Nostrils are the entrance to the air.
Nostrils possess mucus lining and very thin hairs.
The main function of these hairs and the mucus is to filter the air that passes through the nostrils.

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The air passing through the nostrils in humans is filtered by:

After passing through the nostrils, air enters the:

Q. The act of taking in air into the body through nostrils is called ______.

Statement I:Breathing through mouth is not recommended.

Statement II: It is because mouth doesn't have any filter mechanism like nostrils to filter dust from air while breathing.

Choose the correct statement from the following options

(a)The lungs allow only $C O_{2}$ to enter the respiratory system
(b)The nostrils filter the air and allow only $O_{2}$ to pass through them.
(c)The percentage of $O_{2}$ in expired air is 16%
(d)The percentage of $C O_{2}$ in expired air is 4%

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