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TISSUES
I). Definitions
A). Tissue
B). Stem Cells:
C). The 4 types of tissue are:
1). Epithelial
2). Connective
3). Muscle
4). Nervous
II). Epithelial Tissue (Epithelium)
A). Definition:
B). Function
C). Characteristics
1). Composed of tightly packed cells.
2). Free surface that faces the cavity or exterior.
3). Basement membrane nonliving tissue that anchors to underling connective tissue.
4). Supported by Connective Tissue
5). Lacks blood vessels
6). It is supplied by nerve fiber
7). It has a high regenerative ability.
D). Classification
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1). How many layers are present
 | Simple (one layer) |
| Stratified (multi-layers) |
2). The shape of the cells
| Squamous: Flat |
| Cuboidal: square; |
| Columnar: column |
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E). Identification
1). Simple Epithelia
secretion, absorption, and filtration, but not protection.
i). Simple Squamous Epithelium
ii). Simple Cuboidal Epithelium
iii). Simple Columnar Epithelium
iv). Pseudostratified Columnar Epithelium
2). Stratified Epithelium
i). Stratified Squamous Epithelium
ii). Stratified Columnar Epithelium
iii). Transitional Epithelium
iv). Stratified Cuboidal Epithelium
F). Glandular Epithelium
1). Types of secretion
Endocrine: Secrete products into tissue fluid or blood.
Exocrine: Secrete products into ducts that open into some internal or externally
2). Classified by the:
i). Methods of secretion
| Merocrine: expel fluids through vesicles |
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| Aprocrine: Secretions ‘explode’ form cells |
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| Holocrine: release entire cells |
ii). Number of cells:
| Unicellular |
| Multicellular |
iii). Number of ducts
| Simple |
| Complex/compound |
iv). Shapes of the secretory portions
| Tubular |
| Alveolar/acinar |