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Anatomy Exam 1 Tissue Types

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Tissue types summary

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  • November 5, 2024
  • 4
  • 2024/2025
  • Class notes
  • Dr. king
  • Anatomy exam 1
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EPITHELIAL TISSUE: Lines exterior of body, tracts, some glands, and openings to exterior


Epithelial tissue membranes contain epithelial cells
- Includes a mucosa supported lamina propria


FUNCTIONS OF EPITHELIA
• Protection against pathogens + toxins
• Fluid loss regulation
• Secretion, absorption, and excretion


CHARACTERISTICS OF EPITHELIA
• Contains little, if any, matrix
• Cells are linked by cell junctions
• Apical (lumenal) & basolateral surfaces
• Largely avascular – VESSELS DO NOT CROSS BASEMENT MEMRBANE
• Highly mitotic


ENDOTHELIUM IS A TYPE OF EPITHELIUM


GLANDULAR EPITHELIUM
• Generally exocrine
• Secretions may arise from single cells or glands
• Can be found in mucus, perspiration, saliva, milk, cerumen (ear wax)


3 types of glandular epithelium secretion
1. Merocrine – exocytosis of vesicle
a. Relatively common (some sweat glands)
2. Apocrine (decapitation) – apical portion of cell is extruded + released during secretion
a. Axillary sweat glands
3. Holocrine - autolysis of epithelial cell)
a. Sebaceous glands

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