Epithelium & Integument

Question 1

Microvilli

Answer 1

also called brush borders main function is to increase surface area tissue

Question 2

Cilia

Answer 2

• mobile hair-like projections
• an extension of the cytoskeleton function:

coordinated movement movement of cilia causes current to wash away particles, junk, etc (respiratory tract)

Question 3

Stereocilia

Answer 3

very long (longer than microvilli)

non-motile microvilli rigid due to actin filaments function: secretion and absorption

found: epididymis and inner ear

Question 4

Flagella

Answer 4

movement based using tail one per cell sperm

Question 5

Zonula Occludens (Tight Junctions)

Answer 5

stop transport from apical or lateral domains

prevent water soluble elements from passing through

Question 6

Zonula Adherens (Adhering Junctions)

Answer 6

mainly involved in anchoring cells together

beneath tight junctions

plaques of myosin, tropomyosin, and vinculin

Question 7

Macula Adherens (Desmosomes)

Answer 7

has plaques on opposing membranes

cytokeratin filaments present for shearing forces

cell adhesion is mediated by desmoglein

Question 8

Gap Junctions (Connexons)

Answer 8

mediate intercellular communication by allowing rapid spread of information

Question 9

Basement Membrane

Answer 9

basal lamina and reticular lamina

Question 10

Basal Lamina/surface

Answer 10

important in orienting the cell cell to cell interactions selective barrier

Question 11

Basal Lamina Components

Answer 11

Lamina Lucida: extracellular glycoproteins

Lamina Densa: meshwork of collagen fibrils (IV)

Question 12

Reticular Lamina

Answer 12

Produced by fibroblasts made of type I and III collagen

Question 13

Simple squamous epithelium

Answer 13