1 / 25

Epithelial Tissue

Learn about epithelial tissue, its types (squamous, cuboidal, columnar, transitional), functions, and locations in the body. Epithelial cells protect, secrete, absorb, and line body surfaces. Explore simple and stratified epithelium structures.

campbellt
Download Presentation

Epithelial Tissue

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Epithelial Tissue Chapter 4.1 (Human Anatomy)

  2. Histology is the branch of anatomy that studies the structure of animal tissue on a microscopic level.

  3. Whatis a tissue? • A group of cells that all perform the same specific function • Example: cardiac, muscle, or nerves

  4. 4 Types of Tissues • 1) Epithelial Tissue – covers body surfaces and organs, lines body cavities • 2) Connective Tissue – binds and supports body parts

  5. 3) Muscular Tissue – contracts producing movement • 4) Nervous Tissue – responds to stimuli and transmits nerve impulses

  6. Epithelial Tissue • Tightly packed cells • Readily divides (mitosis) producing new cells to replace old or damaged cells • Lacks blood vessels • Exists on the skin and on the surface of organs, blood vessels, and body cavities

  7. Function: - Externally – protects body from drying out, injury, and bacterial invasion - Internally – protects, sweeps up impurities, secretes mucus, absorbs

  8. Free Surface Nucleus Cytoplasm Basement membrane • Covers surfaces and lines cavities • Has a free surface • Other surface attached to underlying tissue by the basement membrane Free Surface Nucleus Basement membrane

  9. Simple Epithelial Tissue – composed of a single layer of cells • Stratified Epithelial Tissue – composed of 2 or more layers of cell

  10. Types of Epithelial Tissues 1] Squamous Epithelium: simple and stratified 2] Cuboidal Epithelium 3] Columnar Epithelium 4] Pseudostratified Epithelium 5] Transitional Epithelium

  11. Squamous Epithelium • 2 types of squamous epithelium: * Simple Squamous Epithelium * Stratified Squamous Epithelium

  12. SIMPLE SQUAMOUS EPITHELIUM: – Single layer of flattened cells – Function: secretion, absorption, and filtration – Location: lines the lungs, blood vessels and heart

  13. Simple Squamous Epithelium Cytoplasm Nucleus

  14. STRATIFIED SQUAMOUS EPITHELIUM – Many layers of flattened cells – Function: protection – Location: outer layer of skin, lining the various orifices of the body

  15. Stratified Squamous Epitlelium

  16. Cuboidal Epithelium • Simple Cuboidal Epithelium: - single layer of cube-shaped cells attached to a basement membrane • Stratified Cubiodal Epithelum: two or more layers of cube-shaped cells

  17. Nucleus Free Surface Basement membrane Simple Cuboidal Epithelium

  18. Simple Columnar Epithelium • Composed of cells that are longer than wider • Nucleus found in the lower half of the cell

  19. Free Surface Nucleus Basement membrane

  20. Pseudostratified Epithelium • Cells appear to be layered due to irregularly placed nuclei but each cell touches the basement membrane • May contain cilia – aids in movement of particles • Function: protection, secretion, movement of mucus and sex cells • Location: respiratory tract, reproductive tract

  21. Cilia Nucleus Pseudostratified Epithelium Basement membrane

  22. Transitional Epithelium • Tissue that changes in response to tension • Found in organs that need to stretch • Location: urinary bladder, ureters, urethra

  23. Free Surface Nucleus Basement membrane Transitional Epithelium

More Related