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प्रश्न
Explain the following:
Mechanism through which a sound produces a nerve impulse in the inner ear.
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उत्तर
The pinna of the external ear collects the sound waves and directs them to the tympanic membrane (ear drum) via the external auditory canal. The ear drum then vibrates the sound waves and conducts them to the internal ear through the ear ossicles. The ear ossicles increase the intensity of the sound waves. These vibrating sound waves are conducted through the oval window to the fluid in the cochlea. Consequently, a movement is created in the lymph. This movement produces vibrations in the basilar membrane, which in turn stimulate the auditory hair cells. These cells generate a nerve impulse, conducting it to the auditory cortex of the brain via afferent fibres. The auditory cortex region interprets the nerve impulse and sound is recognised.
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संबंधित प्रश्न
Write short notes on the following: Cochlea
Which part of our body helps us in maintaining the body balance?
Lightning and thunder take place in the sky at the same time and at the same distance from us. Lightning is seen earlier and thunder is heard later. Can you explain?
State the exact location of the Organ of Corti
What is the function of ear ossicles?
The three parts of human ear contributing in hearing are-
Note the relationship between the first two words and suggest the suitable word for the fourth place.
sound : ear drum :: Dynamic balance : ……
Where is the Cochlea located? Briefly mention its function.
With reference to the human ear, answer the question that follow:
Name the part of the ear associated with
(1) static balance
(2) hearing
(3) dynamic balance.
With reference to the human ear, answer the question that follow:
Name the nerve, which transmits messages from the ear to the brain.
Draw a labelled diagram of the inner ear.
Name the nerve which carries electrical impulses from the cochlea of ear to the brain.
Draw a neat and labelled diagram of the human ear. With the help of this diagram, explain the construction and working of the human ear.
The diagram alongside represents the structure found in the inner ear. Study the same and then answer the questions that follow:
(i) Name the parts labelled A, B, C and D.
(ii) Name the parts of the ear responsible for transmitting impulses to the brain.
(iii) Name the part labelled above which is responsible for:
1. Static equilibrium. 2. Dynamic equilibrium. 3. Hearing
(iv) Name the audio receptor cells which pick up vibrations.
(v) Name the fluid present in the inner ear.
Write whether the following is true or false:
The part of the ear associated with balance is the cochlea.
Differentiate between:
The middle ear and Inner ear.
______ is the smallest bone in the human body.
Note the relationship between the first two words and suggest the suitable word/words for the fourth place.
Eyes: Photoreceptors :: Ears : ______.
- Draw a neat and well labelled diagram of the membranous labyrinth found in the inner ear.
- Based on the diagram drawn above in (i), give a suitable term for each of the following descriptions:
- The structure responsible for hearing.
- The sensory cells that help in hearing.
- The membrane-covered opening that connects the middle ear to inner ear.
- The nerves that carry impulses from the ear to the brain.
- The tube which equalises the air pressure on either side of the ear drum.
