1-21 (b) - The Skin An Outer Garment Skin(Integument...

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The Skin: An Outer Garment
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Skin (Integument) Consists of three major regions: Epidermis – outermost superficial region Dermis – middle region Hypodermis – deepest region
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Skin (Integument) Figure 5.3
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Functions of the Integument Protection: chemical, physical, mechanical barrier - skin secretions have a low pH - melanin protects against UV - wounded skin releases peptides to fight bacteria - glycolipids of epithelium provide water proofing - keratinized cells move to top of epidermis - Langerhans’ cells are macrophages Body temperature regulation - dermal blood vessels dilate (cooling) and constrict (warming) - sweat glands increase secretions to cool body Cutaneous sensation - exoreceptors sense touch and pain
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Functions of the Integument, con’t Metabolic functions – synthesis of Vitamin D in dermal blood vessels Blood reservoir – skin blood vessels store up to 5% of the body’s blood volume Excretion – limited amounts of nitrogenous wastes are eliminated from the body in sweat Thick skin – covers finger tips, palms, soles of feet (5 layers)
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Skin Structure Figure 5.3
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Epidermis Composed of keratinized (tough) stratified squamous epithelium, consisting of four distinct cell types Cell types include: keratinocytes melanocytes Merkel cells Langerhans’ cells Outer portion of the skin is exposed to the external environment and functions in protection
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Figure 5.2 Layers of the Epidermis
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