ANP 1106 Midterm: Revision7.4 (Balance & Hearing) [Special Senses]
10 Apr 2016
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Anp 1106 7. 4 physiology of balance & hearing. A pressure disturbance (alternaing areas of high and low pressure) from a vibraing object. Represented by a sine wave in wavelength, frequency, and amplitude. Amplitude: intensity of a sound measured in decibels (db) loudness of sound is a subjecive interpretaion of intensity. Frequency: number of waves that pass a given point in a given ime pitch is the percepion of diferent frequencies (we hear from 20 20,000 hz cycle/s) Sound vibraions beat against the eardrum (tympanic membrane) The eardrum pushes against the ossicles (litle bones), which presses luid in the inner ear against the oval and round windows. This movement sets up shearing forces that pull on hair cells. Moving hair cells simulates the cochlear nerve that sends impulses to the brain. Open when yawn ear pops due to rush of air into middle ear. The external (outer) ear collects sound waves and passes them inwards.
