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Chapter 5. INTEGUMENTARY SYSTEM. FUNCTIONS OF THE SKIN. The skin has 7 functions: Covers underlying tissues to protect against dehydration, injury, and germ invasion Regulates body temperature Helps manufacture vitamin D Serves as the site of many nerve endings. FUNCTIONS OF THE SKIN.

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Chapter 5 l.jpg

Chapter 5

INTEGUMENTARY SYSTEM


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FUNCTIONS OF THE SKIN

  • The skin has 7 functions:

    • Covers underlying tissues to protect against dehydration, injury, and germ invasion

    • Regulates body temperature

    • Helps manufacture vitamin D

    • Serves as the site of many nerve endings

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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FUNCTIONS OF THE SKIN

  • Temporarily stores fat, glucose, water, and salts

  • Screens out ultraviolet radiation

  • Absorbs certain drugs and chemical substances

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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STRUCTURE OF THE SKIN

  • Layers of the skin:

    • Epidermis - the outermost covering of epithelial cells with no blood vessels

    • Dermis - true skin made of connective tissue and is vascular

    • Subcutaneous (hypodermal layer) lies under the dermis and consists of loose connective tissue

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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STRUCTURE OF THE SKIN

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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APPENDAGES OF THE SKIN

  • Hair

  • Nails

  • Sweat Glands

  • Sebaceous Glands

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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THE INTEGUMENT AND ITS RELATIONSHIP TOMICROORGANISMS

  • Most skin bacteria are associated with hair follicles or sweat glands where nutrients and moisture are present

  • The best way to prevent disease is by washing the hands

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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Acne vulgaris

Athlete’s foot

Dermatitis

Eczema

Impetigo

Psoriasis

Ringworm

Urticaria (hives)

Boils

Herpes

Genital herpes

Shingles (herpes zoster)

REPRESENTATIVE DISORDERS OF THE SKIN

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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SKIN CANCER

  • Basal cell carcinoma is the most common and least malignant skin cancer

  • Squamous cell carcinoma occurs in the epidermis and grows rapidly

  • Malignant melanoma is present in pigmented cells called melanocytes

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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BURNS

  • Burns are the result of radiation from sun, heat, boiling water, steam, fire, chemicals, and electricity

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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BURNS

  • Classification of burns

    • First degree burns

      • epidermis

    • Second degree burns

      • epidermis and dermis

    • Third degree burns

      • destruction of epidermis, dermis, and subcutaneous

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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SKIN LESIONS

  • Pressure Ulcers (Decubitus) are the result of constant pressure against an area of tissue that lies over a bone

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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SKIN LESIONS

  • 4 Stages of pressure ulcers are:

    • Stage I - skin is red but unbroken

    • Stage II - blisters; broken or unbroken

    • Stage III - all layers of skin are broken

    • Stage IV - ulcerated area involves underlying muscles, tendons, and bones

©2004 Delmar Learning, a Division of Thomson Learning, Inc.


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