Describe five general characteristics of epithelial tissue.
On what basis are epithelial tissues classified?
List five major functions of epithelium in the body, and give examples of each.
1. protection; epithelium covering body surface protects against bacterial invasion and chemical damage.
2. absorption; epithelium specialized to absorb substances lines the stomach and small intestines.
3. filtration; in kidney tubules, epithelium filters (and absorbs and secretes)
4. excretion; Sweat is excreted from the body by epithelial cells in the sweat glands
5. secretion; In glands, epithelial tissue is specialized to secrete specific chemical substances such as enzymes, hormones and lubricating fluids
How does the function of stratified epithelia differ from the function of simple epithelia?
Simple means that there is only one layer of these cells, not as much protection as stratified which indicates several layers of cells. Stratified epithelia are named according to the cells at the apical surface of the epithelial membrane, not those resting on a basement membrane like the simple epithelia.
Where is ciliated epithelium found? What role does it play?
Transitional epithelium is actually stratified squamous epithelium with special characteristics. How does it differ structurally from other stratified squamous epithelia? How does the structural difference support its function?
How do the endocrine and exocrine glands differ in structure and function?
What are three general characteristics of connective tissues?
What functions are performed by connective tissue?
How are the functions of connective tissue reflected in its structure?
firm structurally amorphous matrix heavily invaded with fibers; appears glassy and smooth
Why do adipose cells remind people of a ring with a single jewel?
What two physiological characteristics are highly developed in neurons, nerve cells?
Describe how the unique structure of a neuron relates to its function in the body