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19 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Integumentary system
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skin, accessories: hair, nails, glands
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Skin layers
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epidermis, dermis, hypodermis
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Epidermis
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1. outer layer 2. epithelial tissue 3. strata (inner is dividing cells, outer is dead cells shed from the surface) squamous cells that form tight gap junctions to protect against the environment (waterproof)
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Dermis
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supports epidermis. middle layer, dense connective tissue, nerves and blood vessels found here.
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Hypodermis
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subcutaneous layer. loose connective tissue and adipose tissue. insulates and slides over muscle tissue
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Components of skin color
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melanin, carotene, hemoglobin
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Melanin
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brown pigment. made by melanocytes in dermis and transferred to epidermal cells to protect DNA. response to uv light exposure
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Carotene
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orange pigment. found in epidermal and adipose cells. converted to vitamin A
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Hemoglobin
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red pigment. found in red blood cells in the dermis. red pigment with oxygen attached
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Functions of Integumentary system
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sensory, protection, vitamin D3 uptake, lipid storage, excretion, temperature regulation
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6 functions
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Sensory function
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nerve endings are receptors for touch, pressure, pain, temperature. in dermis layer
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Protective function
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DNA, physical environment, microbial.
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three factors
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Keratin
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hard protein made by epidermal cells to protect against abrasion and waterproofing
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2 functions
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Sebum
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oily secretion low in pH. waterproofs skin and retards growth of microorganisms
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2 functions
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Tight gap junctions
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only between epidermal cells. waterproofing and blocks entry of microorganisms
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2 functions
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Vitamin D3
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cholecalciferol. 7-dehydrocholesterol made by cells and taken in by food. uv light converts it to D3 thru epidermis. kidneys use D3 to make calcitriol.
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Calcitriol
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increases calcium and phosphorus absorption from small intestine
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Sensible perspiration
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sweat glands secrete a watery fluid to cool the body
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Insensible sweating
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potential sweating. continuous evaporation of water from the surface of the skin. 500ml per day. sweat glands NOT involved.
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