Integumentary System

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Warm up 11/20 Thursday On notebook paper Why do
humans have skin? Give at least 3 reasons.
2
Warm Up 11-20 On notebook paper

• Why do humans have skin? Name AT LEAST 3 reasons.

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The Integumentary System
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Objectives

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

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Structure and Function
Skin is the largest organ of the body, and serves
to

• Protect other organs and tissues
• Maintain body temperature
• Excrete waste materials through perspiration
  (sweat)
• Function as a sense organ
• Produce Vitamin D

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Three Main Layers of Skin
Structure and Function

• A. Epidermis outer most layer
• B. Dermis Nerves, vessels, glands, hair
  follicles
• C. Hypodermis attaches skin to body, composed
  of fat for warmth

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Structure and Function
Hair - Epidermis

• 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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Structure and Function
Nails - Epidermis

• 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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Structure and Function
Glands - Dermis

• Sweat glands release waste which cools the skin.

• Oil Glands moisten the skin and make it flexible

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Diagnostic, Procedural and Laboratory Tests
The field dermatology is the study, diagnosis and
treatment of ailments to the skin
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Diagnostic, Procedural and Laboratory Tests
Did you know that the skin can be tested for
various diseases and allergies?
Tests for Diseases

• Mantoux test used to detect tuberculosis.
• Schick test used to detect diptheria.

Tests for Allergies

• Patch test
• Scratch test
• Intradermal tests

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Fun Facts

• Skin is the largest organ in your body
• Your skin contains millions of sensory receptors
• You lose 30,000-40,000 dead skin cells every
  minute!