Epithelial Tissues

Question 1

Tissue

Answer 1

a group of similar cells and extracellular products
that perform a common function

Question 2

Four basic tissue types

Answer 2

epithelial, muscle, connective, nervous (E=MCN)

Question 3

Epithelial tissue

Answer 3

“lining of” all cavities/surfaces of structures throughout the body

Question 4

Epithelial tissue function

Answer 4

sensation, physical protection, secretion, selective permeability

Question 5

Intercellular junctions in epithelium (4)

Answer 5

tight, adhering, desmosomes and gap

Question 6

Tight junctions

Answer 6

Encircles cells near their apical surface; Prevents passage between cells

Question 7

Adhering Junctions

Answer 7

Belt-like; Formed completely around the cell deep to the tight junction, Microfilaments act like a purse string to stabilize the apical surface of the epithelial cell

Question 8

Desmosomes

Answer 8

button/snap between adjacent cells that resists mechanical stress; hemidesmosomes stabilize to basement membrane

Question 9

Gap junctions

Answer 9

cell-cell junction (channel passage) is formed by a group of proteins called connexons to form a pore; synchronized signals

Question 10

Epithelia general cell shapes (3)

Answer 10

squamous, cuboidal, columnar

Question 11

Epithelia layers (3)

Answer 11

simple (single), stratified (multiple), pseudostratified (appears as multiple but all touch cell basement), transitional

Question 12

Epithelial surface’s (3)

Answer 12

apical (top), lateral (middle), basement membrane

Question 13

Keratinized cells

Answer 13

“ghost” nuclei because cells are dead and instead contain keratin; located on epidermis of skin; protection

Question 14

Nonkeratinized

Answer 14

cells contain nuclei; located in oral cavity, pharynx, esophagus, vagina, anus; protection

Question 15

Rows present when stratified cuboidal and columnar

Answer 15

2

Question 16

Simple squamous epithelium function/location

Answer 16

rapid diffusion, filtration, and some secretion; Air sacs in lungs (alveoli), lining blood vessels, serous membranes of body cavities.

Question 17

Lumen

Answer 17

white space

Question 18

Stratified squamous epithelium function/location

Answer 18

protect tissues from abrasion or friction; epidermis of skin (keratinized), lining vagina, oral cavity, pharynx, esophagus and anus (nonkeratinized)

Question 19

Simple cuboidal epithelial tissue

Answer 19

lining kidney tubules, ducts of most glands; Absorption and secretion

Question 20

Stratified cuboidal epithelium

Answer 20

large ducts of most exocrine glands and the male urethra; protect and secrete

Question 21

Transitional Epithelium

Answer 21

Lining of urinary bladder, ureters, and part of urethra

Question 22

Stratified columnar epithelial tissue

Answer 22

large ducts of some exocrine glands and in some regions of male urethra; Protection and Secretion

Question 23

Nonciliated simple columnar epithelium

Answer 23

Absorption and secretion

Question 24

Ciliated Simple Columnar Epithelium

Answer 24

lining of uterine tubes

Question 25

Pseudostratified Columnar Epithelium

Answer 25

Ciliated forms line most of the respiratory tract

Question 26

Gland composition and function

Answer 26

epithelial cells; secrete and produce mucin, hormones, enzymes, waste products

Question 27

Gland categories (2)

Answer 27

Endocrine and exocrine

Question 28

Endocrine glands __ possess ducts; they secrete
directly into __

Answer 28

do not; interstitial fluid or bloodstream (endo:in)

Question 29

Exocrine glands __ possess ducts and their cells
__ into their ducts

Answer 29

do; secrete products (exo:out)

Question 30

Goblet cell is a unicellular __ gland with a _ section and a __, which releases __

Answer 30

exocrine; secretory; duct; serous fluid and mucous