1 / 20

Understanding Epithelial Tissues: Structure and Function

Explore the characteristics and types of epithelial tissues in the human body, including cell shapes, arrangements, and classifications. Learn about epithelial cell layers and their roles in protection, absorption, and secretion.

garciaroy
Download Presentation

Understanding Epithelial Tissues: Structure and Function

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. Tissues Histology: the study of tissues

  2. Tissues • A group of interrelated cells that function together and perform specialized activities 4 Types of Tissues in the body • Epithelial • Connective • Muscle • Nervous

  3. Epithelial Tissue • AKA: Epithelium (epi- upon or above) • Functions: (P) Protection (S) Secretions (A) Absorption (F) Filtration

  4. Epithelial Tissue • Characteristics • Closely packed flat cells • Avascular (a- withoutvasc- blood supply), needs are met through diffusion from neighboring cells

  5. Epithelial Tissue • Location • Coverings or linings of organs • Always has a surface exposed to open space or the outside of the body (apical surface) • Underside always attached to connective tissue by a basement membrane • Mitosis is frequent to replace damaged cells since they are “exposed”

  6. Epithelial Tissue • Epithelial tissue is classified two ways • By the cell shape • By the number of cell layers Some may contain goblet cells….these cells are filled with and release mucus. (This type lines the digestive tract and are sometimes referred to as mucosae)

  7. Epithelial Cell Shapes • Squamous- (squashed) flat, nucleus near surface • Cuboidal- (cube) thicker, square shaped with central nucleus

  8. Epithelial Cell Shapes • Columnar- (column) elongated cells, some have microvilli (fingerlike projections that increase surface area), some have cilia (tiny hair-like structures that help move materials along)

  9. Transitional- appearance ranges from flat to columnar, cells can stretch and compress (different shapes in the same layer) Epithelial Cell Shapes

  10. Arrangement of Layers • Simple- single layer, thinness allows substances to permeate easily • Stratified- (strat-layers) multiple layers, protection for areas that endure large amounts of stress, cells grow from the bottom layer up • Pseudostratified- (psuedo-false) one layer, but appears to be multilayered. All cells are attached to the basement membrane, but not all the cells reach the surface

  11. Types of Epithelium • Simple Squamous- single, flat cell layer, nucleus in middle of the cell

  12. Types of Epithelium • Simple Cuboidal- Single layer of cubed shaped cells, nucleus in the middle

  13. Types continued • Simple Columnar- single layer of rectangular cells, nucleus at base, • Non-ciliated- contains goblet cells (mucous) and microvilli (increase surface area) in some areas

  14. Simple Columnar- • Ciliated- single layer of rectangular cells, nucleus at the base

  15. Types- continued • Stratified Squamous- Several layers, larger at the bottom and flattened out at the top, bottom replaces top as the superficial layers shed, can produce keratin

  16. Types- Continued • Stratified Cuboidal- two or more layers, cubed shaped cell

  17. FYI • Stratified Columnar- several layers on columnar in superficial layers • Found in few places of the body (epiglottis, urethra) *you will not be responsible for the identification of this type

  18. Types • Pseudostratified Columnar- single layer, nucleus at different levels, all cells attached to basement membrane

  19. Types • Transitional- range from squamous to cuboidal appearance

  20. Practice Looks for at Home Review • Epithelia Page • 1. Simple Squamous2. Simple Squamous3. Simple Cuboidal4. Simple Cuboidal5. Simple Columnar6. Simple Columnar7. Pseudostratified Columnnar8. Pseudostratified Columnnar (Ciliated)9. Transitional10. Transitional11. Stratified Squamous12. Stratified Squamous13. Stratified Squamous14. Stratified Squamous (Keratinized)15. Stratified Squamous (Keratinized16. Stratified (High) Cuboidal17. Stratified Cuboidal

More Related