1 Integumentary System

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

3 Structure and Function Skin 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

4 Two Main Layers of Skin Skin (epidermis) – outer most layer Dermis – Nerves, vessels, glands, hair follicles

5 Hair Hair 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.

6 Nails Nails 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.

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

8 Test 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.

9 Homeostasis State of having a stable internal environment. Example: teeter totter unbalanced = out of homeostasis. Teeter totter balanced = in homeostasis

10 Homeostasis in the Body Ensures that your body remains constant at 98.6 degrees F. Protects body from external dangers. Removes waste from the body.