-also called integument
-largest organ in the body
bumps and cuts [has pressure receptors]
Acids and Bases [has relatively impermeable keratinized cells]
phagocytes ingest foreign substances and pathogens, preventing from them penatrating into deeper body tissues
Melanin produced by melanocytes offers protection
Desiccation (drying out)
contains waterproofing substances including keratin
activating sweat glands and allowing blood to flush into skin capillary beds
by not allowing blood to flush into skin capillary beds
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