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Hole's Ch. 5 Tissues
Hole's Anatomy and Physiology
9
Anatomy
Undergraduate 1
03/05/2014

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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
define tissue:
Definition
a group of similar cells that carries out a specialized function
Term
Histology
Definition
the science of tissues
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
What are desmosomes?
Definition
spot welds between cells, provides structural support.
Term
What are gap junctions?
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
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