Study Set Content:
TYPES OF TISSUES
Epithelial Connective Muscle Nervous
a covering or lining tissue
Epithelial
a tissue that contracts or shorten making movement possible
Muscle
a diverse primary tissue type that makes up part of every organ in the body
Connective
responsible for coordinating and controlling many body activities
Nervous
covers and protects surfaces, both outside and inside the body
EIPITHELIAL TISSUES
Included under the classification of epithelial tissue are these two glands
exocrine and endocrine
Epithelial Tissue Characteristics
1. Mostly composed of cells
2. Covers body surfaces
3. Has an exposed surface
4. Attaches at the basal surface
5. Specialized cell connections and matrix attachments
6. Avascular
7. Capable of regeneration
Functions of Epithelial Tissues
1. Protects underlying structures
2. Acts as a barrier
3. Permits passage of substances
4. Secreting substances
5. Absorption of substances
Epithelial tissues are classified primarily according to the
number of cell layers and the shape of the superficial cells
The cell layers can be
simple, stratified, pseudostratified
The cell shapes can be
- squamous, cuboidal, columnar, or a special transitional shape, that varies with the degree of stretch.
consists of a single layer of cells, with each cell extending from the basement membrane to the free surface.
Simple epithelium
- consists of more than one layer of cells, but only the basal layer attached the deepest layer to the basement membrane.
Stratified epithelium
- is a special type of simple epithelium, that appears to be falsely stratified.
Pseudostratified columnar epithelium
It consists of one layer of cells, with all the cells attached to the
basement membrane
are flat or scalelike
Squamous cells
Are cube-shaped – about as wide as they are tall
Cuboidal cells
Tend to be taller than they are wide.
Columnar cells
- is a single layer of thin, flat cells
Simple squamous epithelium
