Which of the following statements is true about the role of melanocytes in the epidermis? Melanocytes produce melanin in response to decreased oxygen availability in the dermal layer. Melanocytes are only found in the stratum spinosum and increase the rate of mitosis in response to UV exposure. Melanocytes produce a pigment that helps protect skin DNA from UV radiation damage. Melanocytes are phagocytic cells that migrate through the epidermis to remove damaged keratinocytes.
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The following statement about melanocytes is false: These cells produce eumelanin in response to ultraviolet rays, leading to tanning. These cells need to produce the enzyme tyrosinase in order to produce melanin. Light-skinned people have smaller melanosomes in the Golgi complexes within their skin cells. Dark-skinned people have many melanocytes in the epidermis covering the palms of their hands.
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Which is a pigment producing cell that becomes more active in the presence of ultraviolet light. (A) Keratinocyte. (B) Melanocyte. (C) Merkel. (D) Basal. (E) Langerhans. 1. Squamous cell carcinoma arises from the epidermis. 2. Exposure to UV radiation causes the skin to darken by increasing the production of melanin. 3. The epidermis is rich in blood vessels. (A) All sentences are correct. (B) Only two sentences are correct. (C) All sentences are false. (D) Only one sentence is correct.
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Which of the following statements are correct with regard to melanocytes. a. Melanocytes are derived from neural crest cells that take up residence in the Malpighian layer of the epidermis as well as the base of hair follicles. b. Melanocytes synthesize the pigment protein melanin, which is packaged into small membrane bound structures known as melanosomes, which then get transferred to the developing keratinocytes of the stratum spinosum (spiny layer). c. Melanocytes progress through the various layers of the epidermis, where they eventually flatten out and die, forming the outer dead layer of our skin known as the stratum corneum (cornified layer) d. Only statements a and b are correct e. All three statements, a, b and c,are correct
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