MHR 711 Lecture Notes - Lecture 5: Carcinogen, Asbestosis, Ultraviolet

• School: Ryerson University
• Department: Human Resources
• Course: MHR 711
• Professor: Craig Fairclogh

Document Summary

Physical agents: sources of energy that may cause injury or disease. Ambient: all encompassing condition associated with a given environment, composite of inputs from sources all around us. Early warning change: deterioration of hearing in upper frequency, the earliest detectable sign of noise-induced hearing loss. Noise: any unwanted sound; hazardous sound, standards of measurement: decibel (db) Threshold of hearing: range of sound that human ear can perceive or hear. Hearing response conditional on three characteristics: frequency aka the pitch, the human hearing range is 20 20,000 hz, duration, loudness aka intensity (n/ m2 or pascal) Noise can cause: physiological damage that affects hearing- conductive & sensorineural, more general physiological effects- social withdrawal, headaches, psychological effects- annoying sounds. Physiological damage: conductive hearing loss, restricts transmission of sound to cochlea or inner ear (see figure 5. 1, sensorineural hearing loss (nerve deafness, affects the cochlea and is usually irreversible.