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

People with darker skin benefit in areas with high UV light/radiation because they have lower rates of destruction of:  lactose   folate   vitamin D   calcium

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 .

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

In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). This change in skin color provides evidence that (1) ultraviolet light can cause mutations (2) gene action can be influenced by the environment (3) the inheritance of skin color is an acquired characteristic (4) albinism is a recessive characteristic

Exposure to sunlight helps a person improve his health becauseans.the pigment cells in the skin get stimulated and produce a healthy tanthe ultraviolet rays convert skin oil into Vitamin Dresistance power increasesthe infrared light kills bacteria in the body Previous Marked for Review Next