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How does the frequency of thermoreceptor nerve impulses change during warming?
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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.
During warming, the frequency of nerve impulses in thermoreceptors changes based on the type of receptor involved:
- Warm receptors: These receptors exhibit a dynamic response characterized by a transient increase in discharge frequency when exposed to warming. If the warmer temperature is maintained, the discharge frequency adapts to a new, higher static value.1
- Cold receptors: When these receptors are warmed, they experience a transient decrease, or inhibition, in their discharge frequency. Following this inhibition, the frequency rises again and eventually adapts to a new static value corresponding to the warmer temperature.1
In summary, warm receptors are stimulated by warming, while cold receptors are inhibited by it. These responses allow the nervous system to detect both the direction and the magnitude of temperature changes.123