Eardrum Sound waves hit a thin skin call the eardrum. The sound waves cause the eardrum to vibrate. Three Tiny Bones As the eardrum vibrates, it causes.

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Presentation transcript:

Eardrum Sound waves hit a thin skin call the eardrum. The sound waves cause the eardrum to vibrate. Three Tiny Bones As the eardrum vibrates, it causes the three tiny bones to vibrate.

Liquid in the Ear When the tiny bones vibrate, they cause the liquid to vibrate. The liquid carries the sound waves to nerve endings. Nerve The nerve endings carry the Messages to the brain.

The loudness of sound is measured in decibels. Sounds over 100 decibels (dB for sound) will damage the ears. Airplanes dB Jackhammer 100 dB Loud music dB Talking dB Whispering 20 dB

Stethoscope Microphone Bullhorn Hearing Aid