air filter: (Ex. High-Efficiency Particulate Air Filter) a filter that removes particles, like allergens, in the air by forcing it through screens containing microscopic pores

allergen: something that causes an allergic reaction

alveoli: small sacs located at the ends of bronchial tubes where the exchange of oxygen & carbon dioxide takes place

anticholinergics: medicine that relaxes the muscles around the airways and helps clear mucus

asthma: a respiratory condition that makes breathing difficult

bronchial tube: the airways between the trachea and lungs that swell during asthma flare-ups

cilia: hair-like lining in bronchial tubes that helps to keep airways clean

dander: tiny scales shed from animal skin or hair; major cause of allergic reactions

inhaler: (Ex. Metered Dose Inhaler) a small aerosol device that releases a mist of asthma medicine when button is pressed

mucus: substance secreted by glands airways, nose, and sinuses;         cleans and protects airways; produced in excess during asthma flare-ups

nebulizer: a machine that produces a fine spray of liquid medicine administered through a face mask or mouthpiece

pollen: fine, powdery substance released by plants and trees; allergen

pulmonary function test: a test or series of tests that measure lung function and capacity

respiration: the process of breathing, which includes the exchange of oxygen & carbon dioxide in the blood; the taking in and processing of oxygen, and the delivery of carbon dioxide to the lungs for removal

sinuses: air pockets inside the bones of the head and face that are connected to the nose

spacer: a chamber in a metered dose inhaler (MDI) that helps medicine get into the airways better; also makes MDIs easier to use

steroid: (also: corticosteroid) medicine that reduces swelling and inflammation; comes in pill, injected, and inhaled forms

trachea: the main airway that splits into bronchial tubes in the lungs

triggers: things that cause asthma symptoms to begin or get worse

wheezing: high-pitched whistling sound or air moving through narrowed airways