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Chapter: 11th 12th standard bio zoology Human Body higher secondary school

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EAR - Some Information

EAR - Some Information
Our ears provide us with two vital but very different senses : hearing and balance. Sound detected by the ears provides essential information about our external sourounding and allow us to communicate.

EAR - Some Information

 

Our ears provide us with two vital but very different senses : hearing and balance. Sound detected by the ears provides essential information about our external sourounding and allow us to communicate. In addition our ears contribute to our sense of balance to maintain upright posture and move without falling over.

 

Sound is the sensation produced by longitudinal vibrations in the external environment. Loudness of sound is correlated with amplitude of sound wave and pitch with frequency (No.of waves / unit time). Audible frequencies to humans is in the range 20 - 20,000 cycles per second (cps, Hz). Only the young people are able to hear this full range.

 

Sound perception depends on the loudness as well as frequency. The human ear is most sensitive to 50 - 5000 Hz range. But most sounds we normally hear fall within 500 - 5000 Hz. Since the human ear can

differentiate a wide range of sound energy (the loudest noise perceived is approximately 1012 times more intense than the softest whisper) the decibel (dB) scale is used to measure the intensity of sound.

 

Our ability to hear depends on a complex series of events that occur in the ear. Sound waves in the air are transmitted as vibrations through a series of structures to the receptor for hearing. The physical vibrations are detected and converted into electrical signals. Nerves carry the electrical signals to the brain where they are interpreted. The interpreted messages allow us to perceive the subtleties of sounds such as speech and music.

 

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