Integumentary
System
The integumentary system, consists
of skin, hair, and nails.
The name means “a covering”. The
skin covers the body, the hair covers
the head and other parts of the body
and the nails cover the tops of the
fingers and toes.
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Protect the body’s internal tissues and organs.
 Protect against infectious organisms and injury
 Prevents loss of body fluids
 Regulate body temperature through sweat and
regulating peripheral blood flow
 Remove waste from the body through
perspiration

Generates Vitamin D through exposure to
ultraviolet light.
 Protects against sunburns from ultraviolet
rays.
 Stores fat for fuel and insulation
 Sensory organ with receptors for touch,
pressure, pain, heat, and cold.

Protects the body, allows us to have
sense of touch and helps keep the body
at the right temperature.
 Largest sense organ
 It is made out of 3 layers

› Epidermis
› Dermis
› Subcutaneous
Epidermis.- It is about 30-60 cells thick, at
the bottom new skin cells are forming
and moved towards to top (it takes
about 2 weeks) and older cells die.
 95% of these cells work to create new
cells, the remaining 5% work to make
Melanin, gives the skin its color and
protect from getting burned by the sun.


Dermis.- Contains nerve endings, blood
vessels, hair follicles, sweat glands, and
oil glands. It also contains collagen and
elastin, which are tough and stretchy.
The oil glands secrete an oily substance
that spreads over the epidermis of the
skin to help keep it flexible and
waterproof.

Subcutaneous layer - Made mostly of fat,
helps keep the body warm and absorb
shocks like if you bang something or fall
down.Helps to hold the skin to all the
tissues underneath. In this layer is where
the hair will start.
Protects the fingers and toes
 Made of modified hair and grow from
nail roots or beds
 Filled with a protein called keratin to
become tough and plate-like
 No nerve endings

Grows out of a tiny tube called follicle
 Are large columns of dead cells which
are filled with a tough fibrous protein.
 Color is given by the Melanin in your skin
 Sebaceous gland releases sebum onto
hair that gives it some shine and a little
waterproofing.
