Epithelial Tissue
- Created by: Grace.2006
- Created on: 18-09-23 15:02
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- Tissues
- Simple Cuboidal Epithelial
- Structure:
- Cube-shaped
- Spherical nuclei.
- Line ducts and tubes which can allow materials to pass through.
- Function:
- Diffusion
- Absorption
- Secretion
- Is the process of releasing substances into that fluid or tissue.
- Protection
- Large surface area which improves the efficiency of both absorption and secretion.
- Move substances out of the fluid they are surrounding during diffusion and absorption.
- Location:
- Kidney Tubules
- Sweat Ducts
- Breast Tissue
- Structure:
- Simple Squamous Epithelial
- Structure:
- Very flat
- Each nucleus forms a lump at the centre.
- Scaly
- Very delicate and thin.
- Function:
- To allow materials to pass through
- Diffusion
- The passage of molecules from high to low concentration
- Osmosis
- The passage of water molecules from high to low concentration
- Diffusion
- To allow materials to pass through
- Location:
- Lungs
- Alveoli
- Blood Capillaries
- Kidneys
- Bowman's Capsules of Nephrons
- Lungs
- Structure:
- Simple Columnar Epithelial
- Structure:
- Taller
- Slightly oval nuclei.
- Often have cilia (microscopic filaments)
- Cilia - Tiny hair like organelles attached to he cell surface
- Function:
- Main function is protection.
- Provides a barrier against any bacteria that could be ingested.
- Move particles/ fluid over the epithelial cells and out of the body
- Cilia.
- Main function is protection.
- Location:
- Trachea
- Bronchial Tubes
- Nasal Cavaties
- Stomach Walls
- Interior and Exterior
- Fallopian Tubes
- Small Intestine
- Structure:
- Compound (Stratified) Epithelial
- Structure:
- Several layers of cells.
- Lowest layer of cells are connected to a basement membrane.
- Basement membrane divides and the older cells are pushed upwards.
- Function:
- To protect deeper structures and multiple layers of cells and to hamper the passage of materials.
- Keratinized epithelium is a type of epithelial tissue that us composed of keratinized cells.
- Keratin is protein that helps form hair, nails, and outer layer of skin which gives tissue its tough waterproof proterties.
- This is to help protect against pathogens.
- Keratin is protein that helps form hair, nails, and outer layer of skin which gives tissue its tough waterproof proterties.
- Location:
- Vagina
- Oesophagus
- Mouth
- Tongue
- Structure:
- Simple Cuboidal Epithelial
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