Integument- refers to your skin; means covering --integument is the largest organ of the human body--Components- cutaneous membrane (skin), hair, nails, and exocrine glands (sebaceous and sudoriferous) Function of the Integumentary System: Protection- water loss, heat loss, bacterial invasion, chemicals Excretion- waste removed; excess salt, water, and urea Body temperature regulation- sweating and blood vessel dialation and constriction Cutaneous Sensation- respond to outside stimuli Vitamin D Synthesis- cholesterol molecules are converted into vit. D when exposed to UV rays Blood Reservoir-- holds large volume of blood Two major regions of integument: Epidermis and Dermis