UNIT 2 : Skin Care Flashcards
What is Ultraviolet (UV) radiation?
A high energy form of light from the sun
What are the three different wavelengths of UV radiation?
UV-A
UV-B
UV-C
What are the characteristics of UV-A radiation?
UV-A has the longest wavelength
Its is not absorbed by the ozone layer
Penetrates further than UV-B
What are the characteristics of UV-B radiation?
UV-B radiation is responsible for sunburn of the human skin
UV-B radiation is partially blocked by the ozone layer
What are the characteristics of UV-C radiation?
UV-C radiation is totally absorbed by the ozone layer
We would only encounter UV-C radiation from artificial radiation
What can happen to if substances are exposed to UV light?
Molecules can gain enough energy for bonds to be broken
What can happen if DNA is damaged?
Mutations are caused which stop the DNA functioning properly
What can DNA mutations produce in the body?
Tumours (groups of cells which have not been regenerated properly)
What is melanin?
A natural pigment that is produced when your skin is exposed to sunlight
What does melanin do?
It absorbs the UV radiation found in sunlight to help protect your skin
What does it mean if your skin goes darker after sun exposure, and what does this mean?
It goes darker (tan), a sign that skin has been damaged by UV rays
What breaks down when your skin is exposed to UV radiation?
Collegan
How are wrinkles formed?
Imperfect rebuilding of collagen fibers
What are the two main organic ingredients of sunscreen?
Titanium Oxide
Zinc Oxide
What happens when UV light breaks bonds?
Free radicals are formed
