Our ears hear sound through a process where sound waves enter the ear canal, causing the eardrum to vibrate. These vibrations are then transmitted through the middle ear bones to the cochlea in the inner ear, where tiny hair cells convert the vibrations into electrical signals. These signals are sent to the brain through the auditory nerve, where they are interpreted as sound.
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MCQs
1. What are the tiny bones in the middle ear called?
A) Stirrup, Anvil, and Hammer
B) Femur, Tibia, and Fibula
C) Radius, Ulna, and Humerus
D) Atlas, Axis, and Cervix
Answer: A) Stirrup, Anvil, and Hammer
Explanation: The stirrup, anvil, and hammer (also known as the stapes, incus, and malleus) are the smallest bones in the body and transmit vibrations from the ear drum to the inner ear.
2. What part of the inner ear is filled with fluid and hair cells that help us hear?
A) Cochlea
B) Eustachian tube
C) Ear canal
D) Auditory nerve
Answer: A) Cochlea
Explanation: The cochlea is a spiral-shaped, fluid-filled inner ear structure, it contains hair cells that move when the fluid vibrates, converting sound waves into electrical signals.
3. How do sound waves travel from the outer ear to the inner ear?
A) Through the auditory nerve
B) Through the Eustachian tube
C) Through the ear canal, ear drum, and bones of the middle ear
D) Directly into the cochlea
Answer: C) Through the ear canal, ear drum, and bones of the middle ear
Explanation: Sound waves enter the ear canal, making the eardrum vibrate. These vibrations are then transferred through the tiny bones in the middle ear to the cochlea.
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