Receptor — Science definition

Defined in 3 courses:

Where it is taught

In use

A receptor is the structure that detects a particular kind of stimulus; receptors are specific, so a light receptor in your eye cannot detect sound, and pain receptors in your skin cannot detect colour.

The Nervous System, Senses & Responses

A receptor senses the change and reports it to a control center, which compares the current value to the set point and decides on a response.

Homeostasis & Feedback

A signal can bind a receptor and trigger changes inside a target cell, such as enzyme activity or gene expression.

Cell Signals & Feedback

Questions using receptor

Problem 1

Is a receptor alone the whole sensory experience?
Answer and explanation

No. Signals and processing contribute to perception, interpretation, and response.

Problem 2

A hormone is present, but a cell lacks its receptor. Predict the direct response through that pathway. Explain the reasoning in your own words.
Answer and explanation

The cell will not show the usual direct response through that missing-receptor pathway.

Reception is the first necessary step in the specified pathway.

Without the receptor, the signal cannot initiate that pathway's normal response.

Response criteria

  • Use the stated conditions.
  • Show the evidence or calculation.
  • Explain the conclusion and any stated limitation.

Problem 3

If a receptor is blocked, must the cell's DNA sequence change? Show the reasoning, not just the conclusion.
Hints

Exposure to a signal is not sufficient by itself.

Answer and explanation

No. Signaling can be disrupted without altering DNA sequence.

Problem 4

Two tissues reach the same response maximum, but one responds strongly at a lower signal concentration. Explain the difference and why their response does not prove identical receptor abundance.
Answer and explanation

They differ in sensitivity under the stated comparison, not necessarily maximal capacity. Binding, receptor number, downstream amplification and adaptation can differ; further controlled measurements are required.

They differ in sensitivity under the stated comparison, not necessarily maximal capacity. Binding, receptor number, downstream amplification and adaptation can differ; further controlled measurements are required.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the biological mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

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