Epithelial Tissue

What is the function(s) of an epithelial tissue

1. physical protection (skin)

2. absorption (selective barrier)

3. sensation (rods and cones)

4. secretion (glands)

what are the two types of epithelial tissue

1. covering/lining

• forms outer layer of skin and internal structures

2. Glandular

• forms glands of body

Describe the types of glands

Exocrine

• External

• secrete products into ducts

  • Specific areas of the body

• EX: sweat, saliva

Endocrine

• Internal

• secrete products directly into the bloodstream

  • can go anywhere in body

• EX: thyroid, pituitary

Describe the structure of an epithelial tissue

Apical Surface: Exposed to exterior environment or cavity of organ

• Often with microvilli or cilia

Basal Surface: anchored lower surface

Basal Lamina: adhesive sheet beneath basal surface

• Joins epithelial tissue to connective tissue

What are the three arrangement of tissue layers

• Simple

• Pseudostratified

• Stratified (layers)

What are the three cell shapes of the tissue

• squamous (flat)

• cuboidal

• columnar

What is the role of cilia

moving substances and for sensation

What is transitional epithelium

Tissue changes shape based on where it’s located

• good for stretchy structures