Working of the Human Ear
Working of the Human Ear
Working of Human Ear: Pinna collects the sound waves from the surroundings. These collected sound waves pass through the ear canal (auditory canal) and fall on the eardrum. Since, sound waves are longitudinal waves, these waves consist of compressions (high pressure regions) and rarefactions (low pressure regions).
When a compression of the medium reaches the eardrum, the pressure on the outside of the membrane (eardrum) increases and forces the eardrum inward. Similarly, when the rarefaction of sound wave falls on the eardrum, the pressure on the outside of the membrane (eardrum) decreases and it moves outward. In this way, when sound waves fall on the eardrum, it starts vibrating back and forth rapidly.
These vibrations are amplified several times by the three bones (hammer, anvil and stirr up) in the middle ear and then passes to the liquid in the cochlea. Due to this, the liquid in the cochlea begins to vibrate and the pressure variations are turned into electrical signals by the cochlea. These electrical signals are carried by auditory nerve.
Which of the following are correct : (a) Pinna collects the sound waves from the surroundings. (b) The pressure variations are turned into electrical signals by the cochlea. (c) The electrical signals are carried by auditory nerve. | |||
| Right Option : D | |||
| View Explanation | |||
The outer ear is called ______________ | |||
| Right Option : B | |||
| View Explanation | |||
The function of pinna is : | |||
| Right Option : C | |||
| View Explanation |
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