Chapter 5 Practice Questions

Answer true topic the structural basis of skin color

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Answer: TRUE Topic: THE STRUCTURAL BASIS OF SKIN COLOR 21) One of the factors responsible for variation in skin color in between races is the number of melanocytes in the epidermis. 22) Answer: FALSE 23) Topic: THE STRUCTURAL BASIS OF SKIN COLOR 28) Fingernails consist of hardened glandular secretion from the tissue of the nail root. Answer: FALSE Topic: NAILS 29) The lunula of a nail appears whiter than the rest of the nail due to the structure of the stratum basalis. Answer: TRUE Topic: NAILS 30) Thin skin has fewer epidermal ridges, glands, and sensory receptors than thick skin. Answer: TRUE Topic: TYPES OF SKIN 31) Vitamin D synthesis begins in the skin, as a result of UV radiation altering a precursor molecule. Answer: TRUE Topic: FUNCTIONS OF THE SKIN ESSAY. Write your answer in the space provided or on a separate sheet of paper. 34) Describe the layers of the epidermis. Accompany your answer with a labeled diagram. Answer: The answer should include the names of the layers and a description of the cells in each layer. See Table 4.1 and Figure 4.3 Topic: STRUCTURE OF THE SKIN 3
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35) Describe the tissues and structures of the two regions (layers) of the dermis. Answer: Papillary layer: upper 1/5; areolar tissue with elastic fibers, dermal papillae, blood vessels, corpuscles of touch. Reticular layer: lower 4/5; network of dense irregular connective tissue, elastic and collagen fibers, adipose tissue, glands, hair follicles, blood vessels, temperature receptors. Topic: STRUCTURE OF THE SKIN 38) Diagram the dorsal surface of the distal region of a finger, showing the fingernail. Label all the regions of the fingernail. Answer: See Fig. 4.6. Labels should include: free edge, nail body, lunula, eponychium, nail root. Topic: NAILS SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. 40) Surface patterns that develop on the skin of the hands and feet are due to the presence of dermal papillae and are called _____ ridges. Answer: epidermal Topic: STRUCTURE OF THE SKIN 41) Lipids produced by _____ granules of keratinocytes are responsible for waterproofing the skin. Answer: lamellar Topic: STRUCTURE OF THE SKIN 42) Keratohyalin granules are characteristic of the stratum _____ layer of the epidermis. Answer: granulosum Topic: STRUCTURE OF THE SKIN 44) "Goose bumps" on the skin are due to contraction of smooth muscles called _____, which are associated with hair follicles. Answer: arrectores pilorum Topic: HAIR 45) The _____ of the hair is the portion that projects from the surface of the skin. Answer: shaft Topic: HAIR 46) Chemical sex attractants found in secretions of sebaceous and sudoriferous glands are called _____. Answer: pheromones Topic: SKIN GLANDS 47) The layers of a hair from external to internal are _____, _____, and _____. Answer: cuticle, cortex, medulla Topic: HAIR 48) Thick skin lacks the stratum _____ layer of the epidermis.
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