Lecture 5 Epithelial Tissue

Question 1

What is a tissue?

Answer 1

Collection of similar cells of the same origin to perform a certain function

Question 2

What are the 4 tissue types?

Answer 2

Epithelial Tissue Connective Tissue Muscle Tissue Nervous Tissue

Question 3

What is epithelial tissue?

Answer 3

a cell layer with a free surface; lining a cavity or some body surface that sit on thin layer of extracellular matrix (ECM)

Question 4

What are the 3 origins of epithelia and where they can be found.

Answer 4

Endodermal, Gut + accessory organs Urinary, bladder + respiratory Mesodermal, - kidney -reproductive tract Ectodermal - end of digestive tract - epidermis

Question 5

What are the 4 functional properties of epithelia?

Answer 5

1) Covering, lining, protecting surface –> barriers, 2) transport: absorption + secretion, 3) contractile – myoepithelial, 4) sensory – neuroepithelial

Question 6

______ are a thin layer of ECM and semipermeable barrier that support + polarity to epithelium

Answer 6

basement membrane

Question 7

What is this image of? What stain is used?

Answer 7

Bowman’s capsule in kidney, basement membrane stained with Picrosirius-hematoxylin (PSH) but PAS would work)

Question 8

______ is made up of large glycoproteins, anchor epithelia by integrins and use type IV collagen. ______ is felt like tyoe III collagen.

Answer 8

Basal lamina, reticular laminae,

Hemidesmosomes (H) bind the basal surface of the epithelial cell

Question 9

What structure is indicated in this image?

Answer 9

Terminal bar

Question 10

What is the function of gap junctions?

Answer 10

Communication: electrical, movement of molecules, signal nutrients

Question 11

_______ are surface specializations found in apical membrane (brush border), glycohelix

Answer 11

microvilli

Question 12

What is the function of microvilli?

Answer 12

Increase surface area, absorption epithelial Presences of enzymes (sieve)

Question 13

______ increase absorption capacity, by increasing surface area, are very long microvilli and are a core of actin filament

Answer 13

stereocilia (not true cilia)

Question 14

What are the function of stereocilia?

Answer 14

increase SA

Question 15

______ are motile, longer then microvilli and found in the respiratory tract and reproductive tract that is involved with movement and mixing

Answer 15

Cilia

Question 16

______ epithelia are a single layer flat that has a bulging nucleus

Answer 16

simple squamous

Question 17

______ are a thin, square-shaped epithelium

Answer 17

Simple cuboidal

Question 18

______ epithelia are a thin layer that is taller than is wide, that are specialized for absorption

Answer 18

Simple columnar

Question 19

______ have two or more layers, the top right image is most common, what is it?

Answer 19

stratified, stratified squamous

Question 20

______ are a keratinized dead layer of squamous cells. What is the classification of the image?

Answer 20

stratum corneum, keratinized stratified squamous epithelium

Question 21

________ have abilities to withstand hypertonic effects. _____ state has a bulging appearance.

Answer 21

transitional, undescended

Question 22

______ appears to have several layers, but basal ends rest on BM.

Answer 22

Pseudostratified,

columnar

Question 23

______ are unicellular glands that produce mucin granule and is important for lubrication

Answer 23

Goblet cells

Question 24

Why is H&E poor and PAS good when staining goblet cells?

Answer 24

b/c staining carbohydrate

Question 25

True or False: Ion and water transport across epithelia can occur in either direction, depending on which tissue is involved.

Answer 25

True

Question 26

______ cells have a lot of mitochondria for transport and have various structure in increase SA (microvilli, infolding) .

Answer 26

Absorptive cells