•Draw an epithelium, labeling cell junctions and the apical & basal membranes.
•Explain the role of different epithelial types and different junction types.
Epithelial tissue objectives
Epithelia - cover body surfaces and line body cavities (lumen), form glands
Functions of epithelial cells include: * movement of materials in and out of the body. * protection of the internal environment against the external.* secretion of a product.
Characteristics of epithelial cells:
1. They are contiguous (attached to one another).
2. The cells rest on the basement membrane, an extracellular matrix they produce.
3. They often have two different sides - apical side : towards the lumen - basal side : towards extracellular fluid* Note these cells are polarized, meaning the two cell surfaces
have different functions.
Types of epithelial tissues:
- exchange - transporting- protective- ciliated- secretory
exocrine- mucus, saliva, earwax, milk, oil, digestive enzymes
endocrine- hormones
1.&2. Smooth muscle 3. Transporting
epithelium
4. Secretory epithelium (goblet cell)
5. Lumen
Digestive tract - example organ with multiple tissues
Connective tissue objectives
– List the basic components of connective tissue and their contribution to tissue function.
– Name and describe the different connective tissue types.
Composed of…
specialized cells and their extracellular products
Connective tissue type depends on…1. type of cell specialization2. type and arrangement of protein fibers3. type of ground substance
Connective tissues support, connect, protect, strengthen and insulate other tissues.