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Published byConrad Murphy Modified over 8 years ago
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Integumentary System (Skin)
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What Can You Observe About Skin? Look at the skin on your arms and hands. What does your skin do for your body?
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Using a hand lens, examine the skin on your hand. Look for pores and hairs on both the palm and back of your hand. What Can You Observe About Skin?
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Place a plastic glove on your hand. After five minutes, remove the glove. Then examine the skin on your hand with the lens. What Can You Observe About Skin?
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Think It Over Compare your hand before and after wearing the glove. What happened to the skin when you wore the glove? Why did this happen?
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Skin The Body’s Largest Organ Includes: - Skin - Hair - Nails
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Functions of the Skin - 7 major functions
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Functions of the Skin 1. Covers the body
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Functions of the Skin 2. Prevents the loss of water
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3. Protects the body from infection and injury
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4. Helps to regulate body temperature Functions of the Skin
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4. Regulation of Body Temperature Blood Vessels expand and constrict - Increased blood flow releases more heat Sweat Glands - Skin has about 3 million - Releases sweat onto skin which has a cooling effect
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Functions of the Skin 5. Gets rid of waste (sweat)
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5. Gets rid of Wastes Sweat - Water - Sodium Chloride (salt) - Urea
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6. Receives information from the environment Function of the Skin
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6. Sensory Response Nerve cells in the skin detect and relay information about: - temperature - pressure - pain
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Function of the Skin 7. Produces vitamin D
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7. Formation of Vitamin D Produced in the epidermis Produced when UV light is present Vitamin D allows your body to absorb calcium
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Skin Structure
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2 Layers Epidermis Dermis
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Epidermis Outermost Layer Made of dead skin cells New cells are constantly being made to replace the ones that are rubbed off Contains Melanin
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Epidermis Outermost Layer Made of dead skin cells New cells are constantly being made to replace the ones that are rubbed off Contains Melanin
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Melanin Pigment that gives your skin color Melanin increases in the presence of UV radiation Protects against UV damage
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Dermis “True Skin” Layer below the epidermis Thicker than the epidermis Made of living cells Contains - blood vessels - nerves - sebaceous (oil) glands - sweat glands - hair follicles
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Fatty Tissue Layer Below the dermis Insulates the body “Hypodermis”
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