Question

question 1 (mandatory) (1 point)
case a part 1 for questions #1 - 3
bob, a 49 - year - old house painter, arrives for his appointment with mary, his dental hygienist, to have his teeth cleaned----the first time in three years. mary takes a complete health and dental history. she makes note of the fact that bob smokes approximately two packs of cigarettes a day, occasional cigars at parties, and drinks two or three beers daily after working in the hot sun. he is concerned about the appearance of his lips and teeth.
mary carefully observes his face and lips for any abnormal moles or lesions, noticing that bob has a deep tan and that the left side of his lower lip is raised, firm, and scaly. the lesion is about 9 mm in diameter. bob tells her that his lip has had that appearance for about a year. mary also notes that bobs skin is quite wrinkled for one his age.
question for case a part 1: what is responsible for determining skin color? how does it color skin cells?
melanin; melanocytes produce melanin which will diffuse through layers of skin cells to color them
vitamin d; melanoctyes produce melanin which gets packaged into melanosomes and transfers pigment to nearby skin cells
melanin; melanoctyes produce melanin which gets packaged into melanosomes and transfers pigment to nearby skin cells
vitamin d; melanocytes produce melanin which will diffuse through layers of skin cells to color them

Explanation:

Melanin is the pigment responsible for skin color. Melanocytes, specialized cells in the skin, produce melanin. This melanin is packaged into melanosomes and transferred to nearby skin - cells, giving them their color. Vitamin D is not responsible for skin - color determination.

Answer:

melanin; melanocytes produce melanin which gets packaged into melanosomes and transfers pigment to nearby skin cells