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A 23-year-old woman fell asleep on the beach while sunbathing.She awoke a few hours later to find that she had a very badsunburn. That evening while taking a shower, the lukewarmwater (40°C) touching her back caused her to feel pain. Whattypes of receptors were activated by the lukewarm water andwhy did she experience pain?A. Thermal nociceptors and nociceptive painB. Thermal nociceptors and allodyniaC. Thermal nociceptors and hyperalgesiaD. Innocuous thermal receptors and hyperalgesiaE. Innocuous thermal receptors and allodynia

Question

A 23-year-old woman fell asleep on the beach while sunbathing.She awoke a few hours later to find that she had a very badsunburn. That evening while taking a shower, the lukewarmwater (40°C) touching her back caused her to feel pain. Whattypes of receptors were activated by the lukewarm water andwhy did she experience pain?A. Thermal nociceptors and nociceptive painB. Thermal nociceptors and allodyniaC. Thermal nociceptors and hyperalgesiaD. Innocuous thermal receptors and hyperalgesiaE. Innocuous thermal receptors and allodynia

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Solution

The correct answer is B. Thermal nociceptors and allodynia.

Here's why:

Nociceptors are sensory receptors that respond to potentially damaging stimuli by sending signals to the brain, which then perceives them as pain. Thermal nociceptors are a type of nociceptor that respond specifically to temperature-related stimuli.

In this case, the woman's sunburn has caused damage to her skin, making it more sensitive. The lukewarm water, which would normally not be painful, is perceived as painful because the thermal nociceptors in her damaged skin are more easily activated.

This phenomenon is known as allodynia, where pain is experienced from stimuli that do not normally provoke pain. So, the lukewarm water (which is not normally painful) is causing pain due to the increased sensitivity of the thermal nociceptors in her sunburned skin.

This problem has been solved

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