Choose the correct statement.
Correct answer: C. Photoreceptors are depolarized in darkness and hyperpolarized in light
- A. Nociceptors respond to pressure
- B. Meissner's corpuscles are thermoreceptors
- C. Photoreceptors are depolarized in darkness and hyperpolarized in light
- D. Receptors do not produce graded potentials
Explanation
In the dark, photoreceptors remain depolarized; light causes hyperpolarization, reducing neurotransmitter release.
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About Coordination and Control
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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