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OS 203 Derma Trans 5 > Trans 5 > Flashcards

Trans 5 Flashcards

1
Q

Wavelength of visible light

A

400-760 nm

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2
Q

Wavelength of UV range

A

200-400nm

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3
Q

UV radiation that is termed germicidal radiation

A

UVC

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4
Q

UV radiation that is most biologically active

A

UVB

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5
Q

UV that is referred as the black light

A

UVA

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6
Q

Predominant melanin pigment in dark skinned individuals

A

Eumelanin

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7
Q

Predominant melanin pigment in those w freckles and red hair

A

Pheomelanin

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8
Q

Most obvious responses of the skin to UV radiation

A

Sunburn or tan

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9
Q

Sunburn
Onset?(hr)
Peak? (Hr)
Persists for _ (wk)

A

3-6
12-24
1

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10
Q

T/F only UVB can cause sunburn

A

F, both UVA and UVB can cause sunburn pero mas effective lang ung UVB for causing erythema

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11
Q

UV-B induced inflammation

Effects of PGE2, NO and cytokines?

A

Vasodilation —> red skin

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12
Q

UV-B induced inflammation

Effect of neuropeptides?

A

Itch and pain

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13
Q

Difference between immediate tanning and delayed tanning

A

Immediate - no photoprotection

Delayed - increased epidermal melanin, so may photoprotection

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14
Q

Why is UVA the major contributor to photodamage than UVB

A

UVA (320-400nm) kasi can penetrate deeper into the dermis

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15
Q

Photoaging na may degradation of collagen

A

Wrinkles

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16
Q

What skin types are most at risk for skin cancer

A

Type I and II

17
Q

Active ingredients of physical sunscreen

A

Zinc oxide, titanium oxide

18
Q

Active ingredients of chemical sunscreen

A

Oxybenzone, avobenzone, octsalate, octocrylene, homosalate, octinoxate

19
Q

Active ingredients of sunscreen that absorb both UVA and UVB

A

Oxybenzone, tiatanium, zinc oxide

20
Q

Major lipid classes in stratum corneum

A

Ceramide (50%), fatty acid (10%), cholesterol (25%)

21
Q

2 deficiencies contributing to xerosis

A

Perturbation in the intercellular lipid bilayer, deficiency on NMF

22
Q

3 types of Moisturizers

A

Occlusives
Humectant
Emolient

23
Q

How many hair follicles are there in the human scalp

A

100000-150000 hair follicles

24
Q

Duration of catagen on hair scalp

A

3 weeks

25
Q

Number of hairs shed per day

A

50-100

OS 203 Derma Trans 5 (1 decks)

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