Understanding UV Light and Its Effects

What is a sunburn?

• The reddening of the skin from overexposure to ultraviolet (UV) light

• The darkening of the skin from exposure to visible light

• The cooling of the skin from exposure to infrared light

• The reddening of the skin from exposure to microwave radiation

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What are photons?

• Particles of sound energy

• Packets of energy in sunlight

• Particles of heat energy

• Packets of energy in microwaves

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Which type of light is more dangerous to our skin?

• Visible light

• Infrared light

• Ultraviolet (UV) light

• Microwave radiation

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What are the two forms of UV light?

• UVA and UVC

• UVB and UVC

• UVA and UVB

• UVB and UVD

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What happens when UVA and UVB photons hit your epidermis?

• Molecules within the skin are de-energized

• Molecules within the skin are energized

• Molecules within the skin are neutralized

• Molecules within the skin are ionized

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What is the role of melanocytes in response to UV light?

• They produce more melanin, making the skin look tan

• They produce less melanin, making the skin look pale

• They produce more collagen, making the skin look firm

• They produce less collagen, making the skin look wrinkled

What is the natural absorber of UVA in the skin?

• Collagen

• Keratin

• Melanin

• Elastin

What can result from UVB rays being absorbed by DNA within the skin?

• Skin cancer

• Sunburn

• Tanning

• Wrinkles

What does the term "broad spectrum" on sunscreens indicate?

• It blocks UVA rays only

• It blocks UVB rays only

• It blocks both UVA and UVB rays

• It blocks visible light rays

What is the effect of UV photons on DNA as shown in the diagram?

• UV photons cause DNA to replicate faster

• UV photons cause adjacent bases to bond incorrectly

• UV photons cause DNA to become more stable

• UV photons cause DNA to produce more proteins