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Choose the correct statement.
- Nociceptore 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.
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Nociceptors are pain receptors. Meissner corpuscles, respond to superficial light touch. A receptor potential, also known as a generator potential, a type of graded potential, is the transmembrane potential difference produced by activation of a sensory receptor. A receptor potential is often produced by sensory transduction. It is generally a depolarizing event resulting from inward current flow. Rod cells are photoreceptor cells in the retina of the eye that can function in less intense light. In the dark, the receptor is in a depolarized state, and in the light leading to hyperpolarisation i.e, photoreceptor cells are unusual cells in that they depolarize in response to absence of stimuli or scotopic conditions (darkness). In photopic conditions (light), photoreceptors hyperpolarize to a potential of -60mV. So, the correct answer is option C.
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