Question

Which of the following occurs in the upper respiratory system?

A)air enters the alveoli
B)air enters the bloodstream
C)air is filtered and moistened
D)air is delivered to muscles

Answer 1

c.............................

Answer 2

The correct answer is Option C

The air enters the nasal cavity and it is filtered and moistened their. This is done by the mucous membrane that is present on the inner side of the nasal passage.

The air is filtered and the dust particles gets attached to the mucous and the filtered air is send inside for the exchange of gases.