1. Histology

2. Groups of closely related associated cells that are similar in structure and perform a common function are tissue.
Cytology – the study of cells
Histology – the study of tissue

3. Components of Tissues Cells Extracellular matrix
may be fluid or protein fibers
Matrix
Cell

4. 4 Basic Types of Tissue in Humans
Epithelial tissue
Connective tissue
3. Muscle tissue
4. Nervous tissue

5. Epithelial Tissue

6. Found: 1. coverings and linings – body surfaces,
lines open cavities (digestive and respiratory),
lines blood vessels
and heart,
walls of organs in ventral cavity
2. Glandular - endocrine and exocrine

7. Function: Protection Absorption Filtration Secretion
Take in substances
Filtration
Secretion
Release substances

9. Characteristics: cellularity- mostly cells, little matrix
fit close together (tight junctions and desmosomes)
free surfaces

10. Characteristics:
cellularity- mostly cells, little matrix
Avascular - nourishment by diffusion from underlying tissue
free surfaces
fit close together (tight junctions and desmosomes)
rests on a basement membrane - which reinforces - separates epithelial from connective
regeneration

11. How to identify? identified by cell shape and number of cell layers
* all are many sided in cross section

12. 3 Common Types Based on Cell Height
Squamous - flat
Cuboidal - square
Columnar – column shaped
***nuclear shape the same

13. 2 Based on Cell Arrangement (layer)
Simple - only one cell layer
Stratified - layers are stacked

19. Pseudostratified Ciliated Columnar Epithelial
Free Surface
Cilia
False layers
Basement
Membrane

20. How to Properly Label Epithelial Tissue
Free Surface
This is a cell.
Cell Membrane
Nucleus
Basement Membrane
Connective Tissue