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Question

Choose the correct statement.


Correct Answer
A
Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus
Your Answer
B
Receptors do not produce graded potentials
Your Answer
C
Nociceptors respond to changes in pressure
Your Answer
D
Meissner's corpuscles are thermo receptors

Solution

The correct option is A Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus
Humans rely on retinal rods and cones for the conventional, image-forming vision.
Rods are specialized for low-light vision. They are extremely sensitive and can signal the absorption of single photons.
Cones mediate daylight vision. They are much less sensitive to light than rods but have a higher temporal resolution. They also mediate color vision by several cone types with different pigment spectral sensitivity.
Exposure of the retina to light hyperpolarizes the rods and cones, which send action potentials along their axons to the visual cortex of the brain for processing. The absence of light results in the depolarization of the photoreceptors.

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