Choose the correct statement.
Correct answer: C. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus
- A. Nociceptors respond to changes in pressure
- B. Meissner's corpuscles are thermoreceptors
- C. Photoreceptors in the human eye are depolarised during darkness and become hyperpolarised in response to the light stimulus
- D. Receptors do not produce graded potentials.
Explanation
Photoreceptors in the human eye are unique because they are the only type of sensory cells that are relatively depolarised (about -35mV) when it is at rest (i.e., in the dark), and hyperpolarised (to about -70mV) in response to adequate light stimulus. Nociceptors respond to potentially damaging stimuli that result in pain. Meissner's corpuscles are a type of mechanoreceptor, responsible for touch sensitivity. Receptors generally produce graded potentials called receptor potentials.
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Coordination depends on receptors, neurons, synapses and nerve impulses, with reflex actions traced through the reflex arc and the roles of major brain regions. Chemical coordination covers endocrine glands and hormones, including how hormones regulate growth, metabolism, reproduction and internal balance, unlike rapid nervous control.
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