Tissue - Epithelial

Question 1

Epithelial Tissue

Answer 1

Covering

Sheet of cells that covers/lines

Question 2

Cellularity

Answer 2

Composed of close packed cells

Question 3

Polarity

Answer 3

Exposed/apical surface

Attached/basal surface

Question 4

Basement Membrane

Answer 4

2 layers of noncellular material that reinforce epithelial sheet
• basal lamina - selective filter
• reticular lamina - network of protein fibers

Question 5

Innervated but

Answer 5

Avascular

Question 6

Highly

Answer 6

Regenerative

Question 7

Simple Epithelia

Answer 7

Single layer

Most concerned with absorption, secretion, filtration (as f)

Question 8

Stratified Epithelia

Answer 8

2 or more cell layers stacked together
Regenerates from below
More durable than simple cells
Serve primarily in protection

Question 9

Squamous cells

Answer 9

Flattened & scale like (fried egg)

Question 10

Cuboidal cells

Answer 10

About as tall as they are wide

Question 11

Columnar cells

Answer 11

Tall & column shaped

Question 12

Simple squamous

Answer 12

Flattened laterally (tile floor)
• endothelium - lining for hollow organs
• mesotheliom - serous membranes lining ventral body cavity

Question 13

Simple cuboidal

Answer 13

Single layer of cubical cells
Important for absorption and secretion (as)
i.e.) kidney tubules

Question 14

Simple columnar

Answer 14

Single layer of tall, closely packed cells

Important for absorption and completion

Question 15

Pseudostratified columnar

Answer 15

Cells that vary in height but all rest in basement membrane

i.e.) ciliated lines in respiratory tract

Question 16

Stratified squamous

Answer 16

Several layers
Surface cells (forms external part of skin)

Question 17

Stratified cuboidal/columnar

Answer 17

Rare

Form large ducts of some glands

Question 18

Transitional Epithelia

Answer 18

Lining of urinary organs (subject to stretching and varying internal pressure)
Basal layer are cuboidal/columnar
Apical very in appearance

Question 19

Glandular Epithelia

Answer 19

Consists of 1 or more cells that make and secrete a particular product

Question 20

Endocrine glands

Answer 20

Ductless

Produce hormones

Question 21

Exocrine glands

Answer 21

Have ducts

May secrete a variety of substances (mucus, sweat, oil, saliva, etc)

Question 22

Unicellular exocrine glands

Answer 22

Single cells w/in epithelial cells
Produce mucin (mucus when dissolved in water)

Question 23

Multicellular exocrine

Answer 23

Epithelium derived duck
Secretory unit
• merocrine - secretes products by exocytosis (sweat, saliva)
• holocrine - accumulates products until rupture; sebaceous glands (sebum)
•apocrine - accumulates products under surface; eventually apex/top punches off