Anatomy skin

Anatomy skin - Skin is the largest system of the body 16%...

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Skin • is the largest system of the body – 16% of body weight – you have 21 square feet of it – it weighs 9 pounds – it contains more than 11 miles of blood vessels – you shed 50,000 cells every MINUTE!!!
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Functions of Skin(1) Protects you from infection desiccation UV rays • Important for temperature regulation (insulation and evaporation) • it releases 3 gallons of sweat each day! excretion of salts, water, and organic wastes (glands)
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Functions of Skin(2) Synthesizes vitamin D 3 – which you need to extract calcium from your diet and incorporate it into your bones! Detects sensations – touch, pressure, pain, and temperature: as a huge sensory receptor , the skin is your constant communication with the outside world
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Skin is 1 huge sensory organ! – Nerve sensory receptors for •pa in • touch •v ib
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Components of Skin • Outer Epidermis : epithelial tissue • stratified squamous keratinized • Inner Dermis : connective tissue • loose and dense
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Tooes of the Eoidermis Thin skin : –Cove rs most of the body – This skin is also hairy skin for the most part –Has only a few layers of dead surface cells Thick skin : – Covers the palms of the hands and soles of the feet –Has many layers
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Dermis Source of blood and nutrients for the epidermis Composed of 2 layers: – “papillary” layer: loose connective tissue – “reticular” layer: dense irregular connective tissue Directs the characteristics of the epidermis (skin grafts)
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The Hypodermis AKA subcutaneous tissue or superficial fascia: NOT a part of the “skin” Deep to the dermis – Composed of loose connective tissue (primarily fat) – Location of hypodermic injections
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Major Cell Types of the Epidermis Keratinocytes : – the most abundant cells in the epidermis – synthesize and secrete keratin (a waxy hydrophobic protein that creates a water barrier) – responsible for the “keratinized” epithelium
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This note was uploaded on 04/30/2008 for the course HIST 2301 taught by Professor Trobridge during the Spring '07 term at Texas Tech.

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Anatomy skin - Skin is the largest system of the body 16%...

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