Q.

Which of the following would be the correct sequence of the passage of air during respiration?

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a

Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles

b

 Larynx → nasal cavity’ → pharynx → trachea

c

Larynx → pharynx trachea → lungs

d

 Pharynx → nasal cavity → larynx → trachea bronchi → bronchioles

answer is A.

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Detailed Solution

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Nasal cavity → pharynx → larynx → trachea → bronchi → bronchioles is the correct order of air passage during respiration.

Air is first inhaled into the nasal cavity through the nostrils. Hair and mucus line the nasal cavity, which helps to filter and moisten the air as it is breathed in.

Air enters the pharynx after passing through the nasal cavity, which is a shared passage for both air and food. Air enters the larynx from the pharynx, which is located at the bottom of the pharynx. The larynx houses the vocal cords and controls the flow of air into the trachea.

The trachea, also known as the windpipe, is a tube-like structure that connects the larynx to the bronchi. The trachea is supported by cartilaginous rings, which keep it from collapsing and obstructing airflow.

Air enters the bronchi from the trachea, which are two branches that extend into the lungs.

The bronchi then divide into smaller branches known as bronchioles, which terminate in tiny air sacs known as alveoli. The alveoli are the lungs' gas exchange sites, where oxygen from inhaled air enters the bloodstream and carbon dioxide from the bloodstream enters the exhaled air.

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Which of the following would be the correct sequence of the passage of air during respiration?