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Nociceptors respond to changes in pressure

Meissner's corpuscles are thermoreceptors.

Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus.

Receptors do not produce graded potentials

answer is C.

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Detailed Solution

The light induces the dissociation of retinal from opsin, which causes changes in membrane permeability. As a result, potential differences are generated in photoreceptors rods and cones. In darkness rhodopsin is not active; Sodium and $C {a^{2 +}}_{}$ ion influx is greater than $K^{+}$ efflux, so the rod stays depolarized to an average membrane potential of -40 mV. When light activates rhodopsin, through a series of reactions, cation influx decreases and $K^{+}$ efflux continues and rod hyperpolarize.

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