Lab 2 - Epithelial Cells

What are the two main forms of ET cells?

Proper and Glandular

What are the characteristics of ET?

• apical surface (next to open space)

• basal surface (sits on basement membrane, where connective tissue connects)

• avascular (no blood vessels)

• many cell-to-cell junctions

What are the clinical connections?

Cancerous ET cells are not contained by the basement membrane boundry, so they invade underlying tissues resulting in spread of cancer

What are the 3 classifications?

• squamous

• cubodial

• columnar

What are the number of layers called?

1 = simple

multiple = stratified

Name, Location, Function

Name: simple squamous ET

Locations: Kidney, lining the alveoli, endothelium (lining blood vessels)

Functions: filter blood, easy diffusion for gas exchange, diffusion in small vessles

Name, Location, Function

Name: Simple cubodial ET

Locations: lining kidney tubules and lining ducts

Functions: secretion of substances into urine and reabsorption of substances into blood; lining ducts that carry a substance from a gland to a surface

Name, Location, Function

Name: Simple columnar ET

Location: lining the stomach, small intestine (has microvilli) and large intestine

Function: Secretion of enzymes/mucus into partially digested food, absorption of nutrients from food into blood

Name, Location, Function

Name: Ciliated simple columnar ET

Location: lining the fallopian tubes

Function: Cilia propel eggs across surface of the cells toward the uterus

Name, Location, Function

Name: Ciliated pseudostratified columnar ET

Location: lining the trachea

Function: secretion of mucus. cilia propel mucus towards the throat and away from the lungs

Name, Location, Function

Name: (Nonkeratinized) stratified squamous ET

Location: lining the mouth, esophogaus, vagina, and anal canal

Function: protection in areas of high abrasion

Name, Location, Function

Name: Keratinized stratified squamous ET

Location: epidermis of the skin

Function: protection from external world (trauma, infection, waterproofing)

Name, Location, Function

Name: Transitional ET

Location: lining the bladder and ureters

Function: allows for stretch in urinary organs

Simple squamous

Location: Kidney, alveoli, blood vessel lining

Function: Filter blood, provide a collection bag for filtrate. Easy diffusion for gas exchange. Smooth, thin surface; diffusion in small vessel

Simple cubodial

Location: Kidney tubules, ducts

Function: secretion of substances into urine, reabsorption of substances into blood. Lining ducts that carry a substance from a gland to surface

Simple columnar

Location: Stomach/ intestines, microvilli, cilia

Function: secretion of enzymes/mucus into partially digested food, absoprtion of nutrients from food into blood

Pseudostratified ciliated columnar

Location: Trachea

Function: secretion of mucus, cilia propel mucus toward the throat and away from the lungs

Stratified squamous (nonkeratinized)

Location: Mouth, esophagus, vagina, anal canal

Function: protection in areas of high abrasion

Stratified squamous (keratinized)

Location: Epidermis of skin

Function: Protection from the external world (trauma, infection, waterproofing)

Transitional

Location: Bladder and ureters

Function: allows for stretch in urinary organs

Ciliated simple columnar

Location: Lining fallopian tubes

Function: Cilia propel egg across surface of the cells toward the uterus