You are about to step on a sharp tack, ouch!! As the tack pierces the skin this causes a noxious stimulus. The type of receptor that detects this is a . In the epidermis the become active in order to fight any invading that have entered through the skin. As the tack passes into skin it lands in a layer of skin composed of collagen and elastic fibers, known as the . As you happen to be outside on a hot day, fortunately your skin has a substance which can absorb UV radiation known as . Another action of UV radiation on the skin is the formation of a precursor molecule that is acted on by the liver and kidneys to form .

If you stay out too long at the beach you may get a sunburn as a result of too much heat being transferred to your skin. What mode of heat transfer is responsible for this?Group of answer choicesconductionconvectionradiationnone of the above

Why do some people get sunburned on snowy days?Reflection of sunlight from snowHigher UV radiation levelsAltered skin sensitivity

The substance called is produced in specialized skin cells. It absorbs ultraviolet radiation from sunlight, preventing it from causing mutations in the DNA of skin cells.

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

Outline the three different types of UV radiation and clarify why UVC radiation from the Sun does not damage our skin.