Question

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

Answer 1

The correct option is D Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus

Bright light causes breakdown of rhodopsin into opsin and retinal and resultant hyperpolarized rod cells send less neural signal i.e., reduce light sensitivity while darkness causes repolarization.

A receptor potential is varied potential difference produced across the membrane; it is not all or none response.
Nociceptor responds to pain not to pressure.
Meissner corpuscles are one of the three types of cutaneous mechanoreceptors sensitive to fine touch and are found in the skin of sole.