Britannica
Sources used in this answer
What is the difference between a thermoreceptor's dynamic response and static response?
Created from Britannica articles
using AI.
AI can make mistakes, so verify using Britannica articles.
Thermoreception
Warm-blooded animals, such as polar bears, maintain stable body temperatures and adapt to substantial geographic and seasonal temperature fluctuations. Thermal adaptation is supported by the function of sensory structures called thermoreceptors.
In the study of thermoreception, thermoreceptors exhibit two distinct types of activity in response to thermal stimuli:
- Dynamic Response: This is a transient change in the discharge frequency of a receptor that occurs in response to a sudden change in temperature. For cold receptors, this manifests as a temporary increase in impulse frequency upon cooling; for warm receptors, it is a temporary increase in frequency upon warming. This response is directly related to the prior temperature as well as the magnitude and rate of the temperature change.1
- Static Response: This refers to the steady, continuous discharge frequency of a receptor when exposed to a constant temperature. At a stable temperature, thermoreceptors remain active, with the frequency of this steady discharge determined by the specific temperature of the environment. If a temperature change is maintained, the receptor's dynamic response eventually adapts to this new static discharge level.1
These responses allow thermoreceptors to be sensitive not only to the absolute temperature at the receptor site but also to the direction and rate of thermal change.1