Transcript Integumentary System

Integumentary System
4/29/2013
Integumentary System
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Skin-Epidermis, Dermis,
Hypodermis
Nails-Nail Roots, Keratin in Nails
Hair-Hair Follicles, Keratin in Hair
Glands-Sweat Glands, Sebaceous
Glands, Sebum, Perspiration
Skin
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Epidermis- The epidermis is the
outermost layer of skin and it contains a
lower layer of rapidly dividing cells that
push cells upward as they die, and they
begin to produce keratin forming the
exposed layer of skin.
Dermis-The dermis is the inner middle
layer of skin that contains collagen fibers,
blood vessels, nerve endings, glands,
sensory receptors, smooth muscles, and
hair follicles.
Hypodermis- The Hypodermis is a
subcutaneous layer of fat and loose
connective tissue which helps to insulate
the body.
Nails
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Nail Root- this is an area of rapidly
diving cells near the tip of the nails
on the toes and fingers.
Keratin in Nails-The keratin in nails
is produced in the cells of the nail
root and makes the nails strong,
waterproof, and plate-like.
Hair
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Hair Follicles- these are tube-like
pockets of epidermal cells that
make up hair and they are located
in the dermis.
Keratin- Keratin is in all the dead
cells of hair, making it flexible and
strong.
Glands
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Sweat Glands- Sweat glands secrete
sweat which includes excess salt
and water, and wastes from blood
cells. By secreting sweat, the body
loses heat.
Sebaceous Glands- Sebaceous
Glands secrete sebum, which
spreads across the surface of the
skin and helps the epidermis stay
waterproof and flexible.
Functions of Integumentary System
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Protects body against infection and
injury
Regulates body temperature
Removes waste products from body
Protects body from ultraviolet rays
of the sun.
Protection From Infection and Injury
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Rapid Cell Growth
Production of Keratin
Sebaceous Gland Production Of
Sebum
Regulation of Body Temperature
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Narrowation of blood vessels
Expansion of Blood Vessels
Sweat Gland Production of
Perspiration
Removal Of Waste
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Shedding/Washing of Dead Cells
from Body
Secretion of Perspiration
Providing Protection From Ultraviolet
Rays
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Melanocytes
Melanin
Relationships With Other Systems
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Nervous System-sensory receptors,
nerve endings
Circulatory System-blood vessel
expansion/narrowation
Excretion System-secretion of
perspiration
Medical Problems
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Psoriasis
Alopecia
Pictures Of Psoriasis
Pictures Of Psoriasis
Severe case
Pictures of Alopecia
Pictures of Alopecia
Integumentary System