HUMAN PHYSIOLOGY
CONTROL AND COORDINATION
Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Image is dim
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Image is formed in strong light
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Optic disc is present
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Image is formed in the dark
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Detailed explanation-1: -Blind spot is the region where the optic nerve passes through the optic disk and out of the eyes. Also, it is at this very region that the blood vessels enter the eyes. It lacks photoreceptor cells (rods and cones) in the retina so the light falling at this spot does not form any image.
Detailed explanation-2: -The point where your optic nerves converge to exit the eye and into the brain is known as the optic disc. This area of the eye has no light-sensitive cells to detect light rays. This results in a break in the visual field known as your “blind spot.”
Detailed explanation-3: -In the optic disk, there are no receptor cells. Axons of the retinal ganglion cells gather at the optic disk and form the optic nerve, which carries the neural signal into the brain. Because there are no receptors at the site of the optic disk, this location is also called the blind spot.
Detailed explanation-4: -The optic disc is the round spot on the retina formed by the passage of the axons of the retinal ganglion cells, which transfer signals from the photoreceptors of the eye to the optic nerve, allowing us to see.
Detailed explanation-5: -Similarly, your eyes have a blind spot, called scotoma. The optic nerve carries info from the eyeball to the brain, then, spreads nerve fibers across the back of the eye, or retina. The small round spot where the nerve enters the back of your eye is called the optic disc.