The Question is from neet-zoology , and it was created by the author T HARITHA

Question

Choose the correct statement.

T HARITHA · Accepted Answer

## CORE INFORMATION
✓ **Answer**: D
## CONCEPT FRAMEWORK
	**Primary Concept**: Sensory receptor function and membrane potential changes
	**Related Topics**: Graded potentials, action potentials, sensory transduction, receptor types
	**Prerequisites**: Basic understanding of cell membrane potentials, sensory receptors, and their functions
## SOLUTION PATHWAY
**Given Information**:
	Four statements about different types of receptors and their functions.
**Method & Steps**:
	1. Evaluate each statement based on known receptor physiology.
	2. Identify the correct statement.

**Statement A Evaluation**: Receptors do produce graded potentials. These are crucial for generating action potentials in sensory neurons. This statement is incorrect.

**Statement B Evaluation**: Nociceptors are pain receptors, and respond to noxious stimuli such as tissue damage, extreme temperature, and chemicals. They do not respond to changes in pressure. This statement is incorrect.

**Statement C Evaluation**: Meissner's corpuscles are mechanoreceptors that detect light touch and vibration; they are not thermoreceptors. This statement is incorrect.

**Statement D Evaluation**: Photoreceptors in the human eye are indeed depolarized in the dark and hyperpolarized in response to light, which is a crucial step in visual transduction. This statement is correct.
## OPTION ANALYSIS
[A] :x: Receptors do generate graded potentials which can trigger action potentials
[B] :x: Nociceptors are pain receptors that respond to noxious stimuli
[C] :x: Meissner's corpuscles are mechanoreceptors that detect light touch
[D] ✓: Photoreceptors depolarize in the dark and hyperpolarize in response to light
## LEARNING AIDS
	**Common Mistakes**:
		1. Confusing receptor types: Remembering the specific function of each receptor type is crucial to answering this question correctly. 
		2. Incorrect understanding of depolarization and hyperpolarization: A clear understanding of these terms is required to evaluate option D.
	**Quick Tips**:
		1. Use mnemonics to remember receptor types and their stimuli (e.g., mechanoreceptors - mechanical, thermoreceptors - temperature).
		2. Remember that photoreceptors are unique in that their resting membrane potential is depolarized and they hyperpolarize in response to light.

T HARITHA · Answer

Receptors do not produce graded potentials

T HARITHA · Answer

Nociceptors respond to changes in pressure.

T HARITHA · Answer

Meissner’s corpuscles are thermorecrptors.

T HARITHA · Answer

The correct Option is "Photoreceptors in the human eye are depolarized during darkness and become hyperpolarized in response to the light stimulus."

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