Cartilage is a semi-rigid, avascular connective tissue composed of chondrocytes loosely embedded in an extracellular matrix of collagen fibres, proteoglycans and other, noncollagenous proteins.

Prior to this, experts only knew of three kinds of cartilage: hyaline (the most common type, found in the joints and on bone ends), elastic (found in the larynx and outer ears), and fibrocartilage ...

Bronchitis involves inflammation of the bronchial tubes, leading to symptoms like a persistent cough and difficulty clearing mucus. It can be acute, resolving within weeks, or chronic, requiring ...

Asthma (reactive airway disease) affects an estimated 34 million people in the U.S. Find in-depth asthma information, including treatments, triggers, and prevention.