EPITHELIAL TISSUE

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EPITHELIAL TISSUE
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Epithelial tissue

• 2 types of epithelial tissue
• 1. Membranous
• covers body and lines serous cavities
• blood and lymphatic vessels
• respiratory, digestive, and genitourinary tract

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Epithelial tissue

• 2. Glandular
• is grouped in a solid cord that forms the
  secretory units of endocrine and exocrine glands

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Functions of epithelial tissue

• Protection most important membranous function
• skin protects mechanical and chemical injury

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Functions of epithelial tissue

• Sensory found in skin, nose, eyes, and ears

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Functions of epithelial tissue

• Secretion most important glandular function,
  hormones, mucus, digestive juice, and sweat

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Functions of epithelial tissue

• Absorption tissue in lungs and small intestines

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Functions of epithelial tissue

• Excretion special epithelial lining in the
  kidneys excretion and concentration of urine

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• Epithelial tissue has little or no matrix
• Epithelial tissue connects to underlying
  connective tissue layer by a non-cellular
  adhesive, permeable material (basement membrane)
• Both the epithelial and connective tissue secrete
  the basement membrane

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• Epithelial cells - basal lamina (make basement
  membrane)
• Connective cells - reticular lamina (make
  basement membrane)
• Epithelial tissue has no blood vessels
  (avascular)
• Epithelial tissue is held together by desmosomes
  and tight junctions