A muscle that expands or contracts when breathing.

(a)  

Also known as the voice box, is involved in sound production.

(a)  

It serve as the opening to the respiratory tract.

(a)  

The bronchi branch into smaller tubes known as (a)   .

Also known as windpipe and it connects the larynx and pharynx to the lungs.

(a)  

It is a flap of cartilage that opens during respiration.

(a)  

These are tiny sac-like structures present at the end of bronchioles.

(a)  

It connects mouth and nasal cavity to the esophagus.

(a)  

A process where the air from the atmosphere is transported into the lungs.

(a)