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46 terms

Anatomy and Physiology Ch.5

Test #2
STUDY
PLAY
Damage to elastic fibers in the skin of the elderly results in __________.
wrinkles
Cell divisions within the stratum __________ replace more superficial cells which eventually die and fall off.
germinativum
The epidermal layer that consists almost entirely of keratin is the __________.
stratum corneum
Cerumen is produced by glands located in the __________.
stratum corneum
Cerumen is produced by glands located in the __________.
ear canal
The layer primarily responsible for the strength of the skin is the __________ layer.
reticular
Which of these cells produce the fibers found within the reticular layer of the dermis?
fibroblasts
Which of the following glands secretes oil into the hair follicle?
sebaceous
Sudoriferous glands are also called __________ glands.
sweat
The process of skin repair after injury begins with ___________.
formation of a blood clot
What structures do you find within the hypodermis?
fat and the cutaneous plexus
The papillary layer is more superficial than the reticular layer of dermis. True or false?
true
An important vitamin that is formed in the skin when it is exposed to sunlight is
vitamin d
The type of cells that form the strata in the epidermis are
keratinocytes
When the arrector pili muscles contract,
"goose bumps" are formed
The dermis is composed of the papillary layer and the ___________.
reticular layer
The two components of the integumentary system are the
cutaneous membrane and accessory structures
Water loss due to evaporation of fluid that has penetrated through the skin is termed ________ perspiration.
insensable
________ are cells in the epidermis that are part of the immune system.
dendritic
The layer of stem cells that constantly divide to renew the epidermis is the
stratum germinativum
The epidermis of the skin is composed of which type of tissue?
keratinized stratified squamous epithelium
While walking barefoot on the beach, Joe stepped on a thorn that penetrated through the sole of his foot to the dermis. How many layers of epidermis did the thorn penetrate?
5
Melanocytes _____________.
store melanin in melanosomes
Skin exposed to ultraviolet light increases production of __________.
melanin
The primary pigments contained in the epidermis are
carotene and melanin
Cyanosis signifies that a patient
has oxygen starved skin
The ________ in keratinocytes protects the epidermis and dermis from the harmful effects of sunlight.
melanin
The epidermis recieves blood from which of the following?
dermal arteries called the papillary plexus
The layer of the skin that contains the blood vessels and nerves that are closest to the surface of the skin is the ________ layer.
papillary
The layer of the skin that contains bundles of collagen and elastic fibers responsible for the strength of the skin is the ________ layer.
reticular
Skin inflammation that primarily involves the papillary layer is termed
dermatitis
The layer of soft keratin within the hair shaft is the ___________.
medulla
The layer of hard keratin that coats the hair is termed the
cuticle
Variations in hair color reflect differences in the pigment produced by
melanocytes
Lanugo is found
on a fetus
Glands that discharge an oily secretion into hair follicles are ________ glands.
sebaceous
The ________ glands in the axilla become active at the time of puberty.The ________ glands in the axilla become active at the time of puberty.
apocrine sweat
Which of the following happens if body temperature rises above normal?
blood flow to the skin increases
Fingernails grow from which structure?
nail root
Collagen to repair a deep skin wound is produced by __________.
dermal fibroblasts
Nail production occurs at the nail
root
Mast cells are triggering a response to injury during which phase of repair?
inflammatory
In a penetrating wound, ________ divide to produce mobile cells that repair the dermis.
fibroblasts
If a fair-skinned person is sunburned, why does his or her skin turn red?
the blood flow to the skin increases
Skin can regenerate effectively even after considerable damage has occurred because
stem cells persist in both epithelial and connective tissue components of the skin even after injury
Scar tissue is the result of
large numbers of collagen fibers and relatively few blood vessels in injured areas