Answer true topic the structural basis of skin color

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

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.