Epithelial Tissues

Question 1

Characteristic #1

Answer 1

In close contact w/ each other => little to no intercellular spaces between them
Always have top (apical) and bottom (basal) layers
Avascular (lack blood vessels) => nutrients must diffuse

Question 2

Three types (Single)

Answer 2

Squamous, Cuboidal, Columnar

Question 3

Three types (Stratified)

Answer 3

Squamous, Cuboidal, Columnar,

Question 4

Single Squamous Structure

Answer 4

Single layer of flat cells with disc-shaped nuclei

Question 5

Single Squamous F.

Answer 5

Secretes lubricants in serous membranes

Passage of materials by passive diffusion and filtration (e.g. alveoli)

Question 6

Single Squamous L.

Answer 6

Lungs alveoli

Linings of heart, blood & lymphatic vessels

Question 7

Single Cuboidal S.

Answer 7

Single-layer of cubes with large, spherical nuclei

Question 8

Single Cuboidal F.

Answer 8

Absorption & secretion

Question 9

Single Cuboidal L.

Answer 9

Kidney tubules

Ovary surface

Question 10

Single Columnar S.

Answer 10

Single-layer of columns with oval nuclei

Some have cilia at apical surfaces & goblet cells

Question 11

Single Columnar F.

Answer 11

Absorbtion, secretion of mucus, enzymes & other substances

Ciliated type propels mucus or reproductive cells by ciliary actions

Question 12

Single Columnar L

Answer 12

Non-ciliated form: Lines
- Digestive tract, 
- gallbladder, 
Ciliated form: Lines
- Uterine tubes
- Uterus

Question 13

Stratified Squamous S.

Answer 13

Many layers of cells (squamous in shape)
Deeper layers of cells are cuboidal or columnar
Thickest
2 types:
- Keratinized: contain protective protein keratin
- Non-keratinized: moist lining of body openings

Question 14

Stratified Squamous F.

Answer 14

Protects underlying tissues from abrasion

Question 15

Stratified Squamous L.

Answer 15

Keratinized: epidermis

Non-keratinized: lining of esophagus, mouth & vagina

Question 16

Stratified Cuboidal S.

Answer 16

2 layers of cubes

Question 17

Stratified Cuboidal F.

Answer 17

Protection

Question 18

Stratified Cuboidal L.

Answer 18

Largest ducts of sweat glands

Ducts of mammary glands and salivary glands

Question 19

Stratified Columnar S.

Answer 19

Several layers (basal cells cuboidal, superficial cells elongated) - only observe the apical cells

Question 20

Stratified Columnar F.

Answer 20

Protection & secretion

Question 21

Stratified Columnar L.

Answer 21

Rare tissue type

In male urethra & vas deferens, larges ducts of salivary glands, nasopharynx

Question 22

Transitional Epithelium D.

Answer 22

Basal cells cuboidal or columnar

Superficial cells squamous

Question 23

Transitional Epithelium F.

Answer 23

stretches and permits distension of bladder

Question 24

Transitional Epithelium L.

Answer 24

Ureters, urinary bladder & part of urethra

Question 25

Goblet cells

Answer 25

Produce mucus for internal surfaces

Question 26

Characteristics #2

Answer 26

High regeneration capacity
Innervated
Rest on a basement membrane & are held together by tight junctions
Lines external & internal surfaces
Maybe ciliated or variously specialized

Question 27

Function

Answer 27

Protects underlying structures from wear/infections, pressure
Absorption, secretion, filtration, ion transport, creates slippery surface