The Integumentary System. Skin The largest organ in your body Functions Covers the body and prevents...
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Transcript of The Integumentary System. Skin The largest organ in your body Functions Covers the body and prevents...
Skin• The largest organ in your body• Functions
• Covers the body and prevents water loss• Protects the body from injury and infection• Regulates body temperature• Eliminates wastes (sweat)• Produces vitamin D• Gathers information about the environment• Stores fat for fuel and insulation
Organs of the integumentary system
skinhairnails
The name is derived from the Latin integumentum, which means “a covering.”
Provide Vitamin D
With the help of sunlight, your skin produces vitamin D
Vitamin D is essential in calcium absorption from food
Maintains Homeostasis
Helps to keep the body temperature normal
Has blood vessels that tell the body when it is hot or coldHot – blood vessels get larger and sweating
occursCold – blood vessels constrict to keep blood
in the body’s core
Layers of Skin
Skin consists of three main layersepidermisdermissubcutaneous layer
subcutaneous layer
EpidermisEpidermis – the upper layer of skin where nails
grow and where melanin in located.Every minute, 30,000 - 40,000 skin cells fall off95% of your skin cells make new cells5% make melanin
More sun exposure = more melanin (tan)
dermis - middle layer of skin that contains nerves, blood vessels, sweat glands, oil glands and hair follicles.
hairMade of a strong, dead protein, called
keratin.Grows out of a tiny tube called a
follicle.Hair growth is caused by rapid mitosis
in the follicle.Hair follicles are everywhere except
lipspalmssoles
hair
Over 100,000 follicles on the scalp.Each follicle is attached to a gland that
secretes sebum (oil).Color is partially determined by
melanin.
nails
Modified hair that grows from your cuticle.
Made of keratin.No nerve endings.Protects the end of fingers and toesTakes 6 months to grow from cuticle to
tip.
nails
Fingernails grow faster than toenails.Nails grow faster on your dominant
hand.Nails DO NOT grow after death!
Body systems that work with the integumentary system;respiratory system to get oxygen
and remove carbon dioxide.circulatory system to deliver
oxygen.excretory system to eliminate
waste.
The integumentary system is similar to the cell membrane in a cell.
https://www.youtube.com/watch?v=z5VnOS9Ke3g