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Question 1

UVC range

Answer 1

200 to 290

Question 2

UVB range

Answer 2

290 to 315

Question 3

UVA range

Answer 3

315 to 400

Question 4

What percentage of the suns radiation is UVA?

Answer 4

95%

Question 5

Where is most of UVB radiation absorbed

Answer 5

In the epidermis

Question 6

What is the name of a light absorbing molecules

Answer 6

Chromophore

Question 7

What is the most important chromophore for UVB

Answer 7

DNA

Question 8

What is the most important chromophore for UVA

Answer 8

Porphyrin

Question 9

Definition of Sunburn

Answer 9

Solar erythema and possibly blister formation, followed by desquamation; Histopathologically showsepidermal edema with spongiosis, apoptotic keratinocytes, acanthosis, hyperkeratosis, depletion of Langerhans cells, and an increase in Basal layer and superbasilar melanin content, in addition to inflammatory infiltrate of lymphocytes and neutrophils and vasodilation

Question 10

Onset of erythema due to are UBV and UVA exposure

Answer 10

UVB causes delayed erythema where is UVA in high doses causes immediate erythema reaction followed by a distinct delayed erythema 6 to 24 hours later

Question 11

Differencesin tanning between fair and dark skin

Answer 11

Fair skin (skin type two) usually turns only with UVB doses above the erythema threshold i.e. only with prior sunburn. Darker skin types (three and hire) shows significant any response without a prior sunburn.

Question 12

Key difference between UVA and UVB radiation exposure

Answer 12

A UV induced tan will not protect you as much as a UVB induced tan from subsequent sunlight exposure probably because a UVA induced tan is characterized by less pronounced epidermal thickening and hyperkeratosis