The Skin

The Skin

The Integumentary System Organs of the integumentary system skin hair

nails Integumentary System Composed of skin, hair, sweat glands, and nails The name is derived from the Latin integumentum, which means a covering.

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 Prevents Water Loss Skin prevents water from leaking out of your body Prevents Infection

Skins acts as a barrier to bacteria and viruses Maintains Homeostasis Helps to keep the body temperature normal Has blood vessels that tell the body when it is hot or cold

Hot blood vessels get larger and sweating occurs Cold blood vessels constrict to keep blood in the bodys core Eliminates Waste Sweating eliminates dissolved waste from your body

Gathers Information Skin contains nerves that can feel pain or pressure Provide Vitamin D With the help of sunlight, your skin produces vitamin D

Vitamin D is essential in calcium absorption from food Layers of Skin Skin consists of three main layers epidermis dermis subcutaneous

layer subcutaneous layer Epidermis Outermost layer 30-60 cells thick

No nerves or blood vessels Top layer is dead New cells formed at the bottom of this layer Skin cells shed every 2 weeks Where nails grow Contains melanin Epidermis

Where nails grow Contains melanin Every minute, 30,000 - 40,000 skin cells fall off 95% of your skin cells make new cells 5% make melanin More sun exposure = more melanin (tan)

Dermis Middle layer Contains nerves and blood vessels Contains sweat glands, oil glands and hair follicles Contains collagen

and elastin that allows skin to stretch subcutaneous layer Made mostly of fat Keeps you warm Absorbs shock

Attaches your skin to the underlying tissue hair Made 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 lips palms soles

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 toes Takes 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

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