Ultraviolet (UV) radiation from the sun is the number one cause of skin cancer, but UV light from tanning beds is just as harmful. Exposure to sunlight during the winter months puts you at the same risk as exposure during the summertime. Cumulative sun exposure causes mainly basal cell and squamous cell skin cancer, while episodes of severe blistering sunburns, usually before age 18, can cause melanoma later in life. Other less common causes are repeated X-ray exposure, scars from burns or disease, and occupational exposure to certain chemicals.
“ The nose- Warms and moisten air. The nasal cavities are involved in the resonance of tones.
The oral cavity- Includes the lips, teeth, and tongue. The structures serve as articulators.
The pharynx and the oral cavity- Both act as resonators that selectively amplify to varying degrees of intensity, fundamental tones and overtones.
The larynx- An organ consisting of a cartilaginous framework containing muscles and joints. The vibratile part of the larynx are the vocal folds which are the producers of sound.
The Lungs- They supply a stream of air which passes through the trachea.
The vocal folds- They vibrate throwing the stream of air into a series of complex vibrations. (Punt, 1979 and Henderson, 1979).”
