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Integumentary SystemIntegumentary System

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ObjectivesObjectives

•Name the parts of the Integumentary system and discuss the function of each part.

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Structure and FunctionStructure and FunctionSkin is the largest organ of the body, and serves to:

•Protect against injury•Protect against the sun UV rays•Prevent entry of harmful microorganisms•Maintain the proper internal body temperature •Excrete waste materials through perspiration (sweat)•Function as a sense organ

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Two Main Layers of SkinTwo Main Layers of Skin

SkinSkin (epidermis) – (epidermis) – outer most layerouter most layer

DermisDermis – Nerves, – Nerves, vessels, glands, hair vessels, glands, hair folliclesfollicles

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HairHairHair

•Hair grows out of the epidermis to cover parts of the body.•The shaft is what we see and the root attaches to the muscle in the dermis.

Hair color is determined by the presence of melanin.

Baldness or alopecia may result from heredity, disease, injury, or chemotherapy.

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NailsNailsNails

•Nails are plates made of hard keratin that cover the dorsal surface of the fingers and toes.

•At the base of most nails a lunula or whitish half-moon is an area where keratin and other cells have mixed with air.

•The cuticle is a narrow band of epidermis that surrounds the base or bottom of nails.

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DermatologyDermatology

The field dermatology is the study, diagnosis and treatment of ailments to the skin

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Test for Disease and AllergiesTest for Disease and Allergies

Did you know that the skin can be tested for various diseases and allergies?

Tests for Allergies

•Patch test•Scratch test•Intradermal tests

Tests for Diseases

•Mantoux test used to detect tuberculosis.

•Schick test used to detect diptheria.

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HomeostasisHomeostasisState of having a State of having a stable internal stable internal environment.environment.

ExampleExample:: teeter teeter totter unbalanced = totter unbalanced = out of homeostasis. out of homeostasis.

Teeter totter balanced Teeter totter balanced = in homeostasis= in homeostasis

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Homeostasis in the Homeostasis in the BodyBody

Ensures that your body remains Ensures that your body remains constant at 98.6 degrees F.constant at 98.6 degrees F.

Protects body from external Protects body from external dangers.dangers.

Removes waste from the body.Removes waste from the body.