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Choose the correct statement.

  1. A
    Receptors do not produce graded potentials.
  2. B
    Nociceptors respond to changes in pressure.
  3. C
    Meissner's corpuscles are thermoreceptors.
  4. D
    Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus.

Solution & Step-by-step Explanation

In the dark, photoreceptors (rods and cones) are in a depolarized state due to the "dark current" of sodium ions. When light strikes, it triggers a chemical change that closes sodium channels, causing the cell to become hyperpolarized. Statement D is correct.

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Choose the correct statement.
A
Receptors do not produce graded potentials.
B
Nociceptors respond to changes in pressure.
C
Meissner's corpuscles are thermoreceptors.
D
Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus.

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