Respiratory

Biology

DISEASES OF THE RESPIRATORY SYSTEM

DISEASES OF THE RESPIRATORY SYSTEM

Asthma

Asthma is a chronic disease characterized by narrowing of air passages.

Causes:

Allergy

Due to pollen, dust, fur, animal hair, spores among others.
If these substances are inhaled, they trigger release of chemical substances and they may cause swelling of the bronchioles and bring about an asthma attack. Heredity
Asthma is usually associated with certain disorders which tend to occur in more than one member of a given family, thus suggesting’ a hereditary tendency.