Chapter 6 Review
The dermal papillae interlock with deep projections of the epidermis called
epidermal ridges
The terms thick and thin skin refer to the relative thickness of the
epidermis only
Which epidermal pigment protects nuclear DNA by absorbing potentially damaging ultraviolet radiation?
melanin
Another name for a hair is
a pilus
From the basement membrane outward, the strata of the epidermis are
basale, spinosum, granulosum, corneum
Blueness of the skin due to low oxygen concentration in the blood is called _______________.
cyanosis
Which epidermal layer is found in thick skin only?
stratum lucidum
Which term describes the skin's normal release of water vapor without noticeable sweat? A.sublimation B.dehydration C.insensible perspiration D.sensible perspiration
C. insensible perspiration
Which statement about the subcutaneous layer is false? A.it consists of areolar connective tissue and adipose connective tissue B.it stabilizes the position of the skin and binds it to the underlying tissues C.corresponding to larger body size, it is normally thicker in men than in women D.also called the hypodermis or superficial fascia, it is not part of the integument
C.corresponding to larger body size, it is normally thicker in men than in women
All of the following are important functions of human hair except A.protecting the scalp from sunburn and injury B.preventing entry of foreign particles into the eyes, ears, and nose C.providing insulation for the overall body surface D.assisting in the dispersal of pheromones
C.providing insulation for the overall body surface
the skin of older persons is more easily damaged and slower to heal because A.collagen fibers accumulate through time and crowd out protective cells B.epidermal dendritic cells proliferate, interfering with the immune response C.the epidermis thins as epidermal stem cells decline in number and activity D.all of the above
C.the epidermis thins as epidermal stem cells decline in number and activity
Stretch marks, or striae, are the result of
torn collagen fibers in the dermis
Which of the following is not a significant possible health benefit of carotene? A.protects the skin from harmful radiation in sunlight B.helps maintain normal vision when converted into vitamin A C.helps eliminate potentially dangerous molecules produced by metabolism D.may boost the number and activity of immune cells
A.protects the skin from harmful radiation in sunlight
The epidermis varies within a single individual in which of the following aspects? A.thickness, coloration, and skin markings B.innervation and blood supply C.both a and b D.neither a nor b
A.thickness, coloration, and skin markings
Dermal structures that originate from the invagination of the epidermis include A.the accessory organs of the integument B.sweat and sebaceous glands, nails, and hair C.the integumentary appendages D.all of the above
D. all of the above
Variations in hair color may result from A.environmental and hormonal factors B.genetic differences in the structure of melanin C.an age-related decrease in pigment production D.all of the above
D. all of the above
Skin color differences among both individuals and races are mostly the result of A.different levels of melanocyte activity B.different colors of melanin C.different numbers of melanocytes D.both a and b
D. both a and b
By producing sensible perspiration, merocrine sweat glands assist in A.regulating body temperature through evaporation B.ridding the body of excess water and electrolytes C.protecting against environmental hazards D.all of the above
D.all of the above
Which of the following are specialized cells found in the deeper layers of the epidermis? A.tactile cells B.epidermal dendritic cells C.melanocytes D.all of the above
D.all of the above
The lunula, eponychium, and hyponychium are all structures associated with a
nail
Limited exposure to ultraviolet radiation is useful because
epidermal cells convert a steroid to vitamin D3
Which integumentary exocrine glands are distributed over most of the body surface?
sebaceous and merocrine sweat glands
The connective tissue root sheath and epithelial root sheath are both components of the
hair follicle
Both hair and nails are composed mainly of dead cells packed with
keratin
Which of the following makes no significant contribution to skin color?
keratin
What are the most abundant cells found in the epidermis?
keratinocytes
The two major regions of the dermis are the superficial ____________ layer and the deeper ____________ layer.
papillary; reticular
Which type of gland secretes a lipid material that coats the epidermis and hair shafts to provide lubrication and inhibit bacterial growth?
sebaceous
The relatively coarse, pigmented hair of the scalp, eyebrows, and eyelashes is
terminal hair
Apocrine sweat glands occur in all of the following locations except
the palms
