Epithelial tissue

• What are the shapes of epithelial tissue cells?

  Different shapes, single or multiple layers
• What is simple epithelium composed of?

  One layer of cells
• What is the primary function of simple epithelium?

  Secretory or absorptive function
• What is compound (stratified) epithelium made up of?

  Two or more layers of cells
• What is the primary function of compound epithelium?

  Protective function
• What are the types of epithelial tissues based on shapes?

  • Squamous epithelium
  • Cuboidal epithelium
  • Columnar epithelium
• What is the appearance of squamous epithelium?

  Flat and sheet-like
• Where is squamous epithelium found?

  In alveoli, blood capillaries, Bowman's capsule
• What is the function of squamous epithelium?

  Used for diffusion and osmosis
• What is the appearance of simple cuboidal epithelium?

  Cube-like with equal dimensions
• What is the function of simple cuboidal epithelium?

  Allows materials to diffuse through
• Where is simple cuboidal epithelium found?

  In sweat ducts, kidney tubules, thyroid glands
• What is the appearance of columnar epithelium?

  Column-like, taller than wide
• What are columnar epithelium often associated with?

  Cilia and goblet cells
• What is the function of goblet cells in columnar epithelium?

  Secrete mucus in respiratory and digestive systems
• Where is columnar epithelium found?

  In bronchi, trachea, and small intestine
• What is the role of cilia in columnar epithelium?

  Sweeps dust along with mucus
• What is the function of compound (stratified) epithelia?

  Protect deeper structures and reduce material passage
• Where can stratified epithelia be found?

  In vagina, mouth, tongue, and oesophagus
• What are mucous membranes?

  Stratified epithelia lining various organs
• What is the outer layer of skin called?

  Epidermis
• What is the basement membrane?

  Thin extracellular protein matrix for support
• What is the function of the basement membrane?

  Separates epithelial cells from supporting tissues
• What part of the basement membrane is secreted by epithelial cells?

  Part of the basement membrane itself
• What does the basement membrane provide to epithelial cells?

  Support and connection
• What are the key characteristics of different types of epithelial tissues?

  • Simple Epithelium: One layer, secretory/absorptive
  • Compound Epithelium: Multiple layers, protective
  • Squamous: Flat, used for diffusion
  • Cuboidal: Cube-like, allows diffusion
  • Columnar: Tall, associated with cilia and goblet cells