The blind spot of the eye is the region where
Correct answer: A. the optic nerve leaves the retina and no photoreceptors are present
- A. the optic nerve leaves the retina and no photoreceptors are present
- B. the lens focuses light most sharply
- C. the iris meets the cornea
- D. rods are most densely packed
Explanation
At the optic disc the axons of ganglion cells gather to form the optic nerve, leaving no space for rods or cones, so light falling there is not seen. The point of sharpest vision is the opposite, the fovea.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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