Term
| Name the 4 broad categories of tissues. |
|
Definition
1. Muscular Tissue- specialized to contract
2. Nervous Tissue- conducts, senses, stores information
3. Epithelial Tissue- forms coverings (skin) and linings (blood vessels)
4. Connective Tissues- support transport, protect. |
|
|
Term
|
Definition
| a group of similar cells that carries out a specialized function |
|
|
Term
|
Definition
|
|
Term
| What are the 3 types of cellular junctions and give examples? |
|
Definition
1. Tight Junctions ex: blood-brain barrier, digestive tract
2. Desmosomes ex: epidermis of the skin
3. Gap Junctions ex: within the intercalated discs of cardiac muscle |
|
|
Term
| What are tight junctions? |
|
Definition
| Membranes of adjacent cells fuse together. No space between cells. |
|
|
Term
|
Definition
| spot welds between cells, provides structural support. |
|
|
Term
|
Definition
| connect cells by protein ion channels that allow for cell-to-cell diffusion (transport) of ions. |
|
|
Term
| What are the characteristics of epithelial tissues? |
|
Definition
| Lines cavities, covers surfaces, tightly packed cells, lacks blood supply so nutrient/waste exchange by diffusion, readily divide which makes for rapid healing. |
|
|
Term
| What are the functions of epithelial tissues? |
|
Definition
| protection, secretion, absorption, excretion |
|
|
