SKIN is IN! Objective: To learn the structure and function of the Integumentary System Bell Work: On the surface of your fingers are unique little ridges,

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Presentation transcript:

SKIN is IN! Objective: To learn the structure and function of the Integumentary System Bell Work: On the surface of your fingers are unique little ridges, called fingerprints. What do you think is their purpose? They provide your grip. Without them, things would just slide right out of your fingers! Are any two sets of fingerprints alike? Explain. Nope, not even identical twins have the same prints. Your prints are formed as a result of the swirling of fluid in the womb as you grow! On click, answers to bell work will appear. © 2014 Getting Nerdy, LLC

Made up of the hair, nails, and skin © 2014 Getting Nerdy, LLC

Made of the protein “keratin,” grows from follicle Hair: Made of the protein “keratin,” grows from follicle Found all over body except lips, palms and soles of feet Functions in warmth, protection, and immune defense Characteristic of mammals Oil Gland Follicle Muscle Hair Shaft Epidermis Dermis © 2014 Getting Nerdy, LLC

Made of the protein “keratin,” grows from root Nails: Made of the protein “keratin,” grows from root Found on fingers and toes (phalanges) Functions in protection and as a tool for precise activities Free Margin Nail Plate Nail Bed Lunula Matrix Root © 2014 Getting Nerdy, LLC

Skin: Your skin is the largest organ of your body and is made up of three layers of tissue: Epidermis: outer layer composed of epithelial cells Outermost cells are dead and rub off New cells are constantly made at the base/bottom of the epidermis. Melanocytes: cells produce melanin - pigment that protects your skin and gives it color Dermis: the middle layer composed of connective tissue Contains blood vessels, nerve fibers, muscles, oil, sweat glands, and other structures. Hypodermis (fatty layer): below the dermis - insulates body © 2014 Getting Nerdy, LLC

Human Skin Cross-section magnified 100x EPIDERMIS DERMIS Human Skin Cross-section magnified 100x © 2014 Getting Nerdy, LLC

Skin Cross-section Epidermis Dermis Hypodermis Hair from hair follicle Sweat Gland Oil gland Nerve Blood Vessels 4 1 5 6 2 7 3 8 © 2014 Getting Nerdy, LLC

Sense our environment through touch Function: Forms a protective covering over the body which prevents infection and water loss Sense our environment through touch Formation of Vitamin D during exposure to the sun © 2014 Getting Nerdy, LLC

Regulation of body temperature Blood vessels in skin help release/hold heat Perspiration (sweating) to keep cool and shivering to keep warm © 2014 Getting Nerdy, LLC