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  • Protection: covering and lining surfaces. protect underlying tissues.
  • Sensation: Sensory stimuli are detected by specialized epithelial cells. Specialized epithelial tissue containing sensory nerve endings is found in the skin, eyes, ears and nose and on the tongue.
  • Secretion: In glands, epithelial tissue is specialized to secrete specific chemical substances such as enzymes, hormones and lubricating fluids.
  • Absorption: Certain epithelial cells lining the small intestine absorb nutrients from the digestion of food.
  • Excretion: Epithelial tissues in the kidney excrete waste products from the body and reabsorb needed materials from the urine. Sweat is also excreted from the body by epithelial cells in the sweat glands.
  • Diffusion: Simple epithelium promotes the diffusion of gases, liquids and nutrients. Because they form such a thin lining, they are ideal for the diffusion of gases (e.g. walls of capillaries and lungs).
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