Question

Mechanism of ear and eye [in points]

Answer 1

Mechanism of eye

The eye captures and focuses light like a camera. Here is a step-by-step explanation of how the eye works to provide you with vision:

• Light enters the eye through the cornea (the clear, dome-shaped surface that covers the front of the eye).
• From the cornea, the light passes through the pupil. The amount of light passing through is regulated by the iris, or the colored part of your eye.
• From there, the light then hits the lens, the transparent structure inside the eye, which focuses light rays onto the retina.
• Finally, it reaches the retina, the light-sensitive nerve layer that lines the back of the eye, where the image appears inverted.
• The optic nerve carries signals of light, dark, and colors to the area of the brain (the visual cortex), which assembles the signals into images (our vision).

Mechanism of ear

• Sound funnels into the ear canal and causes the eardrum to move.
• The eardrum vibrates with sound.
• Sound vibrations move through the ossicles to the cochlea.
• Sound vibrations cause the fluid in the cochlea to move.
• Fluid movement causes the hair cells to bend. Hair cells create neural signals which are picked up by the auditory nerve. Hair cells at one end of the cochlea send low pitch sound information and hair cells at the other end send high pitch sound information.
• The auditory nerve sends signals to the brain where they are interpreted as sounds.