Question

Draw a flow chart to show the sequence
of the passage of air from the nose to
the lungs.​

Answer 1

• In human beings, air is taken through the nostrils . The entire nasal passage is lined with fine hairs and mucus which help in the filtration of air . From nostrils, the air passes through the throat and ultimately into the lungs.

• The Rings of cartilage are present in the throat which ensure that the air passage does not collapse.

• Within the lungs , the bronchi divides into bronchioles and bronchioles finally terminate in balloon like structures called alveoli which provide a larger surface where the exchange of gases can take place.

• The walls of alveoli contain an extensive network of blood vessels which help in easier Transportation of gases to all the cells in the body.

• During breathing, ribs get raised which flatten the diaphragm resulting in larger chest cavity. Due to this, air is sucked into the lungs and fills the expanded alveoli (inhalation).

• During the breathing cycle, when air is taken in and let out (exhalation), the lungs always contain a residual volume of air so that there is sufficient time for oxygen to be absorbed and for the carbon dioxide to be released.

Hope it helps you

Answer 2

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