Question

Draw the human respiratory system and label its parts.

Answer 1

Respiratory system:

The respiratory system in humans includes the nose, pharynx, larynx, trachea, bronchi and the lungs.

1. Nose:
   • The two openings in the nose are known as nostrils that lead to the nasal chamber.
   • It has a hairy lining to prevent dust particles from reaching into the lungs.
2. Pharynx:
   • The pharynx is the narrow tubular part which acts as a common passage for food and air.
   • The air inhaled through the nostrils passes into the pharynx and then enters the air tube called the trachea.
3. Larynx:
   • The larynx is a thin-walled tubular structure present in the neck region which is known as the voice box.
4. Trachea:
   • The larynx is followed by a long tubular structure known as the trachea or windpipe.
5. Bronchi:
   • The trachea posteriorly divides into two main structures known as primary bronchi and secondary bronchi.
   • Bronchi is a long narrow tube through which air passes from the trachea to the lungs.
   • These bronchi split into numerous branches known as bronchioles.
   • The terminal ends of bronchioles bulge out to form extremely thin-walled tiny air pockets known as alveoli.
6. Lungs:
   • Lungs are the chief respiratory organs where the exchange of gases takes place.
   • It is a pair of spongy, elastic organs that lies in the thoracic cavity.
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