LooseLeaf for Human Anatomy
5th Edition
ISBN: 9781259285271
Author: Michael McKinley Dr., Valerie O'Loughlin, Elizabeth Pennefather-O'Brien
Publisher: McGraw-Hill Education
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Textbook Question
Chapter 5, Problem 6MC
Which statement is true about melanin and melanocytes?
| a | Melanin is produced by cells that are located in the stratum spinosum. |
| b | Melanin is a pigment that accumulates inside keratinocytes. |
| c | Darker-skinned individuals have more melanocytes than lighter-skinned individuals. |
| d | Albinism is caused by a lack of melanocytes in the body. |
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Chapter 5 Solutions
LooseLeaf for Human Anatomy
Ch. 5 - What are the two major layers of the integument...Ch. 5 - Prob. 2WYLCh. 5 - Why is the stratum spinosum important in...Ch. 5 - Briefly describe the process of keratinization....Ch. 5 - Prob. 5WYLCh. 5 - How do melanocytes help protect the skin?Ch. 5 - Briefly describe the structure of epidermal ridges...Ch. 5 - What is indicated by the lines of cleavage in the...Ch. 5 - Prob. 9WYLCh. 5 - Prob. 10WYL
Ch. 5 - Why does the lunula of the nail have a whitish...Ch. 5 - Prob. 12WYLCh. 5 - Compare and contrast merocrine and apocrine sweat...Ch. 5 - What do sebaceous glands secrete?Ch. 5 - What is the source of new epidermal cells and new...Ch. 5 - Why do skin repair processes take longer as we...Ch. 5 - What is the cause of increased sensitivity to the...Ch. 5 - Match each numbered item with the most closely...Ch. 5 - Prob. 1MCCh. 5 - Prob. 2MCCh. 5 - The sweat glands that communicate with skin...Ch. 5 - Which of the following is not a function of the...Ch. 5 - Prob. 5MCCh. 5 - Which statement is true about melanin and...Ch. 5 - Prob. 7MCCh. 5 - Prob. 8MCCh. 5 - Prob. 9MCCh. 5 - Water loss due to evaporation of interstitial...Ch. 5 - Prob. 1CRCh. 5 - Describe two ways in which the skin helps regulate...Ch. 5 - Prob. 3CRCh. 5 - Prob. 4CRCh. 5 - Prob. 5CRCh. 5 - Prob. 6CRCh. 5 - Describe how the skin is involved in vitamin D...Ch. 5 - Prob. 8CRCh. 5 - Prob. 9CRCh. 5 - Prob. 10CRCh. 5 - Prob. 1DCRCh. 5 - Prob. 2DCRCh. 5 - Prob. 3DCR
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- In people who have the genetic disorder anhidrotic ectodermal dysplasia, patches of tissue have no sweat glands. What kind of tissue does this disorder affect?arrow_forwardIn albinism, the formation of melanin, a dark skin pigment, are blocked so that albinosarrow_forwardWhich of the following associations is INCORRECT? A. Keratinocytes; found in the stratum spinosum B. Langerhans cells; immune cells C. Melanocytes; typically found in the stratum corneum D. Adipocytes; fat cells E. None of the abovearrow_forward
- Mark the following statements as true or false. If a statement is false, correct it to make a true statement.a. Melanocytes account for the bulk of the epidermis. b. Keratinocytes begin life in the stratum corneum and gradually are pushed into the stratum basale. c. Dendritic cells are phagocytes of the immune system that protect the skin and deeper tissues from invasion by pathogens. d. Merkel cells produce the pigment melaninarrow_forwardHow do melanocytes and keratinocytes work together to protect the skin from UV damage? a. Keratinocytes maintain the proper pH for melanocytes to synthesize melanin granules. b. Keratinocytes provide the melanocyte with nutrients critical for melanin synthesis. c. Keratinocytes maintain the appropriate temperature so the melanin will not denature. d. Keratinocytes accumulate melanin granules to shield the keratinocyte’s DNA.arrow_forwardMark the following statements as true or false. If a statement is false, correct it to make a true statement. a. The primary skin pigment is melanin, which is derived from the amino acid tyrosine. b. Melanin is produced by melanocytes and covers the nuclei of neighboring dendritic cells. c. Carotene is a brown-black pigment that accumulates in the stratum corneum. d. Increased amounts of blood flowing through the dermis lead to pallor in the skin. e. Hemoglobin is a pigment found in red blood cells, and its color depends on the oxygen level of the blood.arrow_forward
- 24-year-old delivery driver is involved in an accident and sustains a wide abrasion over his left elbow The abrasion results in the total loss of epidermis over a large area of his left arm, but one month later, the abrasion has healed, with regrowth of the epidermis. Which of the following mechanisms accounts for the restoration of the epidermis over the abraded area? A. Growth of epidermis from hair follicles and sweat glands in the dermis B. Migration of endothelial cells from newly grown capillaries C. Transformation of dermal fibroblasts into epidermal cells D. Transformation of macrophages into epidermal cells E. Transformation of melanocytes into epidermal cellsarrow_forwardWhich statement is NOT true of the epidermis? O A. Melanocytes produce melanin, which protects living skin layers from bacteria O B. Anunbroken stratum corneum prevents the entry of pathogens and many chemicals OC. The stratum corneum consists of keratinized dead cells that prevent the loss or entry of water O D. Mitosis takes place in the stratum basale, and new cells are pushed toward the skin surfacearrow_forwardWhich of the following statements about melanocytes and keratinocytes is true? a. Melanocytes are in the dermis and keratinocytes are in the epidermis b. Melanocytes produce pigment but keratinocytes do not. c. Both cell types produce waterproofing material. d. Both cell types divide and die as they move away from their blood supply.arrow_forward
- As we age, our skin wrinkles due to changes in collagen and elastic fibers in the dermis and a decrease in their production. Explain why topical application of collagen and elastic fibers would not eliminate wrinkles.arrow_forwardBriefly describe how melanin provides protection for our skin and describe what physiological and anatomical changes occur to your skin when you have excessive sun exposure.arrow_forwardCells of the epidermis derive from stem cells of the stratum basale. Describe how the cells change as they become integrated into the different layers of the epidermis. What determines the color of skin, and what Is the process that darkens skin when it is exposed to UV light?arrow_forward
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