integumentary system Flashcards
structure of the integumentary system
the integumentary system consists of
hair
skin
nails as well as
sebaceous, sudoriferous, ceruminous glands
structure of the integumentary system
within the skin there are
hair follicles
sweat glands
blood vessels
structure of the integumentary system
the skin can be divided into the
epidermis (outer layer)
dermis (middle layer)
subcutaneous or hypodermis (inner layer)
the 3 layers of the integument
epidermis
outer layer of the skin
the 3 layers of the integument
the epidermis consists of
keratinized, stratified, squamous epithelial tissue
the 3 layers of the integument
cells migrate from the deeper region to the
exterior surface of the epidermis as they age
during this time they become more flattened, slough off, and are replaced by younger cells
the 3 layers of the integument
the dermis is which layer of the skin
middle layer of the skin
the 3 layers of the integument
around hair follicles (the tubes from which hair grows) the epidermis dips down into the middle layer of the skin called the
dermis
the 3 layers of the integument
the epidermis is made up of
dead cells on the outside
and it has an inner layer of living cells
structure of the integumentary system
the epidermis also includes cells known as
melanocytes
structure of the integumentary system
melanocytes produce and distribute
melanin which is a skin pigment
structure of the integumentary system
the dermis contains
collagen
blood vessels
glands
hair follicles
nerve endings
structure of the integumentary system
the inner most layer is the
hypodermis
functions of the integumentary system: protection
a function is protection the epidermis provides
a barrier between the body and outside pathogens such as bacteria
functions of the integumentary system: protection
it also prevents the body from
drying out
functions of the integumentary system: protection
the inner cells of the epidermis divide
quickly, pushing older cells toward the surface
these old cells die and create a tough waterproof outer surface
functions of the integumentary system: protection
melanocytes in the epidermis produce
melanin,
helps protect the body from ultraviolet radiation from the sun
functions of the integumentary system: protection
skin cells also produce
nails that protects the tips of fingers and toes
functions of the integumentary system: excretion
along with water, minerals, including sodium, chloride, and magnesium are excreted by
glands
functions of the integumentary system: excretion
when these minerals build up in the body they are
excreted in high amounts
functions of the integumentary system: excretion
sweat can also contain trace amounts of
urea
lactic acid
alcohol
functions of the integumentary system: between body and the environment
the skin contains
sensory nerve endings that allow the body to detect touch, change in temp, pain
functions of the integumentary system: between body and the environment
these nerve endings are found in the skin’s
dermis layer
functions of the integumentary system: between body and the environment
skin also produces
vitamin D when ultraviolet light hits the skin
homeostasis & the integumentary system
when the body becomes too warm,
sweat glands produce sweat
homeostasis & the integumentary system
the evaporation of sweat on the skin creates a
cooling effect
homeostasis & the integumentary system
blood vessels in the skin can also dilate when the body is
warm
homeostasis & the integumentary system
the dilates blood vessels carry more blood closer to the
skin’s surface and this can appear as flushed cheeks
homeostasis & the integumentary system
the blood is then cooled and
returned to the deeper tissue at a cooler temp
homeostasis & the integumentary system
if the body is too cold, blood vessels
constrict so that less blood is carried to the skin surface
practice problems
which of the following is the layer of the skin that forms a protective, waterproof barrier?
a. dermis
b. sudoriferous
c. sebaceous
d. epidermis
d. epidermis
practice problems
which of the following best describes the function of meloncytes?
a. secretion of substances like minerals and alcohol
b. production of melanin
c. absorption of vitamin d
d. sensing the environment
b. production of melanin
practice problems
which of the following layers of the skin contains hair follicles?
a. dermis
b. sudoriferous
c. sebaceous
d. epidermis
a. dermis
practice problems
which of the following layers of the skin contains a layer of dead cells?
a. dermis
b. sudoriferous
c. sebaceous
d. epidermis
d. epidermis
