NROC64H3 Chapter Notes - Chapter 11: Stria Vascularis Of Cochlear Duct, Cochlear Duct, Thalamus

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2 systems that have different functions but have similar structures and mechanisms: audition - hearing. 2. vestibular system balance, internalized process that informs where and how we move. Hearing is important while balance is something we rarely think of. Sounds are audible variations in air pressure, almost anything can move air molecules when objects move toward patch of air, it compresses air = increase density of molecules - produce variations. Frequency of sound is number of compressed patches of air that pass by ears hertz/hz (number of cycles/second) Whether sound is perceived high or low, or pitch, is determined by frequency. Intensity: difference in pressure b/w compressed and rarefied patches of air, sound intensity determines the loudness we perceive loud sounds have higher intensity. Box 11. 1: of special interest: ultrasound and infrasound p. 378. Visible part of ear has cartilage + skin, funnel called pinna (latin: wing ) collects sound from wide area, more sensitive to sound form ahead.

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