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-also called integument
-it's pliable
-largest organ in the body

Mechanical Damage

bumps and cuts [has pressure receptors]

Chemical Damage

Acids and Bases [has relatively impermeable keratinized cells]

Bacterial Damage

phagocytes ingest foreign substances and pathogens, preventing from them penatrating into deeper body tissues

Ultraviolet Radiation

Melanin produced by melanocytes offers protection

Thermal Damage

contains heat/cold/pain

Desiccation (drying out)

contains waterproofing substances including keratin

Heat Loss

activating sweat glands and allowing blood to flush into skin capillary beds

Heat retention

by not allowing blood to flush into skin capillary beds

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