The hair cells responsible for detecting sound of different frequencies are located in the inner ear within the cochlea. Each hair cell is a different length and is responsible for detecting certain frequencies and bend, when that frequency is reached, releasing electrochemical pulses to the brain to identify the sounds and hear what is being said. The apex of organ of corti contains longer hairs which are sensitive to low pitched frequencies and the Base of the organ of corti consists of shorter hairs which are sensitive to higher pitched frequencies. these hairs are lined up from apex to base so that when a frequency enters the hair are bend to a certain point which make us able to distinguish levels of frequency.

Figure 21.1 represents the Fibres in the basilar membrane. From the longer hairs at the apex to the shorter hairs at the base.

Aubusson, Eileen Kennedy Peter. Biology in Context: the Spectrum of Life. Victoria : Oxford Uni. Press., 2001. Print.
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