SB:Epithelial Tissue

On left side at top of page (in the margin)

(Common Features)1.Free surface: cells that are NOT attached to membrane2. Nucleus: directs cell activities3. Basement membrane: site of attachment for lowest layer of cells

a. Simple squamousStructure: 1 layer of flat cellsFunction: Easy/quick O2 & CO2 exchange in lungs & capillaries; filtrationLocation: Lungs (alveoli, air sacs), walls of capillaries, lining body cavities

b. Simple cuboidalStructure: 1 layer of cube shaped cellsFunction: filtration & absorption; secretionLocation: glands;ducts, walls of kidney tubules, ovaries

c. Simple columnarStructure: 1 layer of column shaped cellsFunction: secretion & absorption (nutrients)Location: lines entire digestive tract

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(in yellow) 4. Goblet cells-secrete mucus for lubrication

WU: Epithelial Tissue

1. What are the 3 basic cell shapes?2. What is the difference between simple and

stratified epithelium?3. What type of simple epitheliuma. Lines entire digestive tractb. Allows easy/quick gas exchangec. Found in walls of kidney tubulesd. Function is secretion & absorption

d. Pseudostratified ciliated columnarStructure: 1 layer of cells that appear to be at different heightsFunction: absorption, secretion, protection (traps debris & sweeps it out)Location: Respiratory tract

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5. Cilia-hairs that sweep debris away from lungs

On left side of page 12

• Write in the top margin1. Free surface2. Nucleus3. Basement membrane

a. Stratified squamousStructure: multiple layers of flat cells at the surfaceFunction: protection against frictionLocation: esophagus, mouth & outer surface of skin

b. TransitionalStructure: a modified version of stratified squamous*surface cells= round & bulbous when relaxed & flat when filledFunction: allows cells to stretch & store urineLocation: bladder, ureters, urethra