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Electrotherapy Lecture 2: Ultraviolet Radiation by Dr. Shimaa Taha

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Electrotherapy Lecture 2: Ultraviolet Radiation by Dr. Shimaa Taha

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Questions and Answers

Which type of Ultraviolet Radiation causes immediate erythema?

Luminous and nonluminous sources

Luminous sources only (correct)

Nonluminous sources only

Absorbed as heat

What is the difference between immediate erythema and delayed erythema caused by Ultraviolet Radiation?

Immediate erythema is mottled, while delayed erythema is homogenous

Immediate erythema is dark reddish, while delayed erythema is light pink

Immediate erythema lasts 20-30 minutes, while delayed erythema lasts several days (correct)

Immediate erythema lasts several days, while delayed erythema lasts 20-30 minutes

What distinguishes the physical effect of Ultraviolet Radiation on the skin from the chemical effect?

Physical effect lasts several days, while chemical effect lasts 20-30 minutes

Physical effect is absorbed as heat, while chemical effect is not (correct)

Physical effect is luminous, while chemical effect is nonluminous

Physical effect causes immediate erythema, while chemical effect causes delayed erythema

How long does delayed erythema last after exposure to Ultraviolet Radiation?

<p>Several days</p> Signup and view all the answers

Which color best describes delayed erythema caused by Ultraviolet Radiation?

<p>Light pink</p> Signup and view all the answers

Study Notes

Ultraviolet Radiation and Erythema

UVB radiation causes immediate erythema.
Immediate erythema is a reddening of the skin that occurs immediately after exposure to UV radiation, caused by dilation of blood vessels in the skin.
Delayed erythema is a reddening of the skin that occurs several hours after exposure to UV radiation, caused by damage to the skin's cells.
Physical effects of UV radiation on the skin include heat and immediate erythema.
Chemical effects of UV radiation on the skin include sunburn (delayed erythema) and DNA damage, which increases the risk of skin cancer.
Delayed erythema typically lasts for 12–24 hours after exposure to UV radiation.
Delayed erythema typically appears red or pink.

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Description

This quiz covers the physical and chemical effects of Ultraviolet Radiation (IRR UVR) discussed in Lecture 2 of Electotherapy, including immediate erythema, delayed erythema, and differences in impact from luminous and non-luminous sources.