Epithelial Cells and Microscopes

Simple Squamous- Cell Shape and arrangement

single layer, hexagonal, flat

Simple Cuboidal- Cell Shape and arrangement

single layer, cube shaped

Simple Columnar- Cell Shape and arrangement

single layer, tall and narrow cells

Pseudostratified- Cell Shape and arrangement

single later, only some reach the free (visible) surface

Stratified Squamos- Cell Shape and arrangement

several layers, cuboidal in basal layer and get progressively flatter

Stratified Cuboidal- Cell Shape and arrangement

somewhat cube-shaped, multiple layers

Stratified Columnar- Cell Shape and arrangement

multiple layers, tall and thin cells

Simple Squamos- special features

thin, selectively permeable

simple cuboidal- special features

microvillii (bronchi, prevents bronchitis)

simple columnar- special features

sometimes have microvilli and cilia (fallopian tubes)

pseudostratified- special features

cilliated w/ goblet cells which make mucus

stratified squamos- special features

can be keratinized

simple squamous- functions + location

lets materials pass by diffusion in the lungs and blood vessels; smooth lining. (lines air sacs)

simple cuboidal- functions + location

secretes and absorbs in kidney tubules and small glands.

simple columnar- functions + location

absorbs nutrients and secretes mucus/enzymes in the (lining of) stomach and intestines.

pseudostratified- functions + location

secretes mucus and moves it with cilia in the trachea and bronchi (respiratory tract).

stratified squamous- functions + location

protects against friction and damage in the skin, mouth, and esophagus.

stratified cuboidal- functions + location

protects gland ducts (including from infection) and secretes sweat, milk, or other gland products (mammary glands).

stratified columnar- functions + location

protects ducts (male urethra, large gland ducts) and secretes mucus or gland fluids.

transitional epithelium- functions + location

stretches and protects bladder and uterus

condenser

focuses light onto slide so you can see clearly

rotating nose piece

holds objective lenses, lets you switch between them

objectives: 4x, 10x, 40x

lenses that magnify images

eyepiece

lens you look through

body tube

connects the eyepiece to the objectives

body

main frame that hold everything together

arm

the side handle that supports top parts; hold when carrying

coarse adjustment knob

big knob that moves stage up and down for focusing

fine adjustment knob

small knob used for sharp, detailed focusing after coarse adjustment

stage

flat platform where you place slide

stage clips (side holder)

metal pieces that hold slide in place

substage (illuminator lamp)

light source under stage