Question

write the path travelled by a molecule of oxygen when it enters the body

Answer 1

First the air comes in body through nostrils. Here the air is made warm and moist.

Then it passes through pharynx which is also called naso pharynx.

Then through larynx (located in neck region in front of trachea)

Then it travels through trachea

Then into bronchi

From bronchi to bronchioles

And finally into alveoli. In alveoli gaseous exchange takes place.

Answer 2

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