Histology lecture 3_ Epithelium

Question 1

Have you read the clinical boxes from Junqueira Ch 4?

Answer 1

yes or no

Question 2

What are the three types of epithelial cells

Answer 2

1) Squamous
2) Cuboidal
3) Columnar

Question 3

What are the three ways epithelial cells can be arranged

Answer 3

1) Simple (single layer of cells)
2) Stratified (multipul layers or cells)
3) Pesudostratified (single layer of cells where each cell is fixed to the base membrane but not all of them reach the apical surface)

Question 4

What is unique about keratinized cells?

Answer 4

they have no nucleus

Question 5

Describe microtubules

Answer 5

A component of the cytoskeleton that forms the structure of cilia.

Question 6

Describe Dynein

Answer 6

A motor protein that causes the whipping motion of the microtubular cilia structure

Question 7

Describe microfilliments

Answer 7

A component of the cytoskeleton that is composed of actin filliments

Question 8

Intermediate filliments

Answer 8

A component of the cytoskeleton that maintains the cell shape and fixes the position of organells

Question 9

Describe Cilia

Answer 9

An apical feature composed of microtubules often used to move things within the body (ie the muccous elevator)

Question 10

Describe micro villi

Answer 10

An apical feature composed of actin filliments that increases surface area to improve either absorbtion or secretion. microvilli extend into the cell and anchor to the terminal web

Question 11

Review slide 12

Answer 11

yes or no

Question 12

Transcellular transport

Answer 12

substance travels thtough the the cell by entering and exiting through the cell membrane

Question 13

Paracellular transport

Answer 13

substance passes between cells through junctional complex

Question 14

Zonula occludens (tight junctions)

Answer 14

seals the interstitial space between cells against paracellilar transport. typically near the apical surface of the cells. Resides within the membrane of respective cells

Question 15

Zonula adherens (adheren junctions)

Answer 15

joins adjacent cells around an entire transverse section. Extends into the cytoskeleton of cells.

Question 16

Macula adherens (desmosomes)

Answer 16

a spot weld that joins adjacent cells. Extends into the cytoskeleton

Question 17

Plicae

Answer 17

folds in the lateral membrane of a cell. Common in luminal tissue to in crease surface area for absorbtion.

Question 18

hemi desmosome

Answer 18

similar to a desmosome. anchors cells to the basement lamina rather to an adjacent cell.

Question 19

Merocrine

Answer 19

Exocrine classification where membrane bound vesicle fuse to apical membrane and release contents to lumen (exocytosis)

Question 20

Holocrine

Answer 20

Exocrine classification where secretory products build in the cytoplasm until cells undergo apoptosis and relese secratory products alond with cellular debris.

Question 21

Apocrine

Answer 21

Exocrine classification where secratory products with some cytoplasm are released within an evelope of plasma.