Bronchodilator

The airways that connect the lungs to the trachea (windpipe) and allow air to pass into and out of the lungs.

A small airway in the respiratory system that connects to the alveoli (air sacs); a branch of the bronchial tubes.

Unusual sound, heard through a stethoscope, that blood makes when it rushes past an obstruction, like a blockage in an artery.