Epithelial Tissues

Question 1

Location and function

Answer 1

All epithelial tissues are coverings and lining of tissues and can form glands

Question 2

Cells

Answer 2

Tightly packed into one or more sheets/layers

Question 3

Polarity

Answer 3

Have top and bottom
Apical region= free surface, not attached to another tissue; can have cilia, microvillia, or be smooth
Basal region=bottom area of cell
Only epithelial tissue has top and bottom

Question 4

Cilia

Answer 4

Hair like extensions to move stuff across the surface or top of the plasma membrane of an epithelial cell

Question 5

Microvillia

Answer 5

Microscopic folds on surface of plasma membrane

Question 6

Basement membrane

Answer 6

Sticky material between epithelial and connective tissue
Holds epithelium in place and prevents tearing, stretching, or shredding

Question 7

Mitosis

Answer 7

All epithelial tissues can replace themselves by cell division

Question 8

Nerve supply

Answer 8

All epithelial cells are innervated (have nerve supply)

Question 9

Epithelial Vessel supply

Answer 9

They are avascular (none)
Epithelial tissues receive nutrients and oxygen from vessels in underlying connective tissue

Question 10

Tips to ID epithelial tissue

Answer 10

Cells packed tightly together, no blood vessels, and free surface

Question 11

2 ways of classifying epithelial tissue

Answer 11

A) by cell arrangement = number of cell layers
B) by cell shape: squamous, cuboidal, columnar

Question 12

Cell arrangement

Answer 12

1) simple - one layer of cells
2) stratified - more than one layer of cells

Question 13

Classification by cell shape

Answer 13

All epithelial tissues are classified when viewed from the side
1) squamous - thin and flat with disc shaped nucleus
2) cuboidal - square with rounded nucleus
3) columnar - rectangular with oval shaped nucleus

Question 14

Pseudostratified epithelium

Answer 14

Pseudo means false, but all cells touch basement membrane

Question 15

Stratified epithelium

Answer 15

Cells in various layers are not all the same shape, so stratified epithelia are named for the shape of the cells at the free surface

Question 16

Keratinized cells

Answer 16

Cells filled with a waterproofing protein known as keratin
Stratified squamous epithelium can be keratinized or non-keratinized

Question 17

Transitional epithelium

Answer 17

transition means change, the tissue has the ability to change shape depending on how expanded the organ is
Found in urinary bladder