3-2-3 Unit 3

Unit 3 Lecture Study Guide

1. List the 4 primary tissue types and give the general characteristics and functions of each one.

1. Epithelial- covers body surfaces, lines hollow organs, and forms glands. Protects exposed and internal surfaces from abrasion, dehydration, destruction by chem/boil. agents

2. Connective- found in every organ; consists of cells and fibers separated by extracellular matrix; enclose organs as a capsule and separate organs into layers.

3. Muscle- Contracts or shortens with force when stimulated; moves entire body and pumps blood

4. Nervous- have the ability to produce action potentials

2. How are epithelial tissues classified?

• Simple- one layer of cells. Each extends from basement membrane to the free surface

• Stratified- more than one layer

• Pseudostratified- tissue appears to be stratified, but all cells contact basement membrane so it is in fact simple

3. How does the type of epithelial tissue relate to its function? Give at least 1 example of where you would find each type of epithelial tissue.

• Simple; allows diffusion of gases, filtration of blood, secretion, absorption- lining of the heart

• Stratified; protection, particularly against abrasion (epidermis of skin)- dry skin

• Squamous: allow diffusion or acts as filters- mouth

• Cuboidal and columnar: secretion and/or absorption- uterus

4. Differentiate between exocrine and endocrine glands. Give an example of each.

• Exocrine- open to exterior of body via ducts (sweat, oil)

• Endocrine- no contact with exterior of the body; ductless; produce hormones (pituitary, thyroid, adrenals, pancreas)

5. What is the difference between apocrine, merocrine and holocrine glands? Which is the most common?

• Apocrine- fragments of the gland go into the secretion. Apex of cell pinches off.- Mammary Glands

• Merocrine- No loss of cytoplasm. Secretion...