Hi,
Trachea is a narrow tube that connects the pharynx to the bronchi of the respiratory system. The trachea is supported by a series of cartilaginous rings that prevent it from collapsing.
The air enters the trachea after passing through the nose and larynx. Trachea carries the air to the bronchus.
Alveoli are air sacs present in lungs where exchange of gases take place during respiration.
