Question 4 (1 point) Which of the following cells/products \'provide powerful de

Question

Question 4 (1 point)

Which of the following cells/products 'provide powerful defense against UV light?'

SELECT ANY ANSWERS THAT ARE CORRECT.

Question 4 options:

answer not listed

keratin as produced by keratinocytes

hemoglobin as found in red blood cells

melanin as produced by melanocytes

carotene as found in foods

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Question 5 (1 point)

Although many drugs are used to treat “alopecia” (balding) the action of many drugs is unknown. For example, Minoxidil (Rogaine®) can stimulate hair growth and slow balding by causing follicles to enter anagen (active hair
growth phase). Other drugs can block the breakdown of androgens (such as testosterone or DHT (the more active “form” of testosterone)). In females, excessive hairiness is often associated with elevated androgen levels, so drugs like ALDACTONE (anti-androgen) drugs are effective. With this information, you could probably conclude that male pattern baldness is probably due to changes in:

Question 5 options:

Gender

Weight

Body size

Age

Male hormones

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Question 6 (1 point)

Which of the following cells/products 'are part of the immune system' in the epidermis?

SELECT ANY ANSWERS THAT ARE CORRECT.

Question 6 options:

keratin as produced by keratinocytes

hemoglobin as found in red blood cells

carotene as found in foods

melanin as produced by melanocytes

answer not listed

answer not listed

keratin as produced by keratinocytes

hemoglobin as found in red blood cells

melanin as produced by melanocytes

carotene as found in foods

Explanation / Answer

Answer 4. Option B

Melanin has the property of effectively absorbing light. Due to this the pigment is able to efficiently dissipate around 99.9% of the UV radiation which is absorbed. This property helps melanin in protecting skin cells from UV radiation damage.

Answer 5. Option E

Since the breakdown of androgens is being blocked to slow balding this means that hormones play an important role in the process of hair growth and balding.

Answer 6. Option A

The epidermis is made up of many types of cells out of which the major part which is around 90% is composed of keratinocytes. They have important immune defense roles in the epidermis. The keratinocytes are responsible for producing antimicrobial peptides and also express pattern recognition systems.

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