Question

question 40 (1 point)
which three pigments contribute to skin color?
carotene, melanin, hemoglobin
keratin, melanin, hemoglobin
melanin, keratin, trichsidorin
hemoglobin, carotene, keratin
question 41 (1 point)
a patient taking a drug that inhibits cell division (such as certain chemotherapy
layer of the epidermis to be affected first?
stratum corneum
stratum lucidum
stratum spinosum
stratum basale

Explanation:

For Question 40:

• Carotene: It is a yellow - orange pigment that can accumulate in the skin, especially in the stratum corneum.
• Melanin: Produced by melanocytes in the stratum basale, it is the most important pigment for skin color, ranging from yellow to black.
• Hemoglobin: Gives a pinkish - red hue to the skin, especially noticeable in lightly pigmented skin where blood vessels are close to the surface.

Keratin is a protein (not a pigment) that provides structural strength to the skin. Trichsidorin is not a recognized skin - color - contributing pigment.

For Question 41:

• The stratum basale is the deepest layer of the epidermis. It contains stem cells (basal cells) that are actively dividing to produce new keratinocytes. A drug that inhibits cell division will affect these actively dividing cells in the stratum basale first.
• The stratum corneum consists of dead, keratinized cells. The stratum lucidum (only in thick skin) and stratum spinosum have cells that are not as actively dividing as those in the stratum basale.

Answer:

Question 40: A. Carotene, melanin, hemoglobin
Question 41: Stratum basale