Epithelial Tissue

Question 1

Parenchymal cells

Answer 1

Responsible for organs specialised functions

Question 2

Stroma cells

Answer 2

Have supporting roles in organs

Question 3

Epithelial tissue rest on the

Answer 3

Basement membrane composed of connective tissue

Question 4

Epithelial does not contain

Answer 4

Blood vessels

Question 5

Lamina propria

Answer 5

Connective tissue underlying epithelia lining organs of digestive, respiratory and urinary system

Question 6

Papillae

Answer 6

Small evagination in membrane to increase SA found in the tongue

Question 7

Basal pole

Answer 7

Surface of cell contacting connective tissue

Question 8

Apical pole

Answer 8

Surface of cell facing open space

Question 9

Function of epithelial tissue

Answer 9

Covering, absorption, secretion, sensation

Question 10

Shapes of epithelial cells

Answer 10

Squamous (flat, flattened nuclei)
Cuboidal (equal dimensions with centrally round nucleus)
Columnar (hight 2-5x greater than width, elongated nucleus)

Question 11

Basement membrane

Answer 11

Basal lamina - nearest to epithelial basal pole, consisting of network of fine fibrils
Reticular lamina - beneath BL made of type 3 and 7 collagen

Question 12

Simple epithelium

Answer 12

Single layer of cells all in contact with basement membrane

Question 13

Types of simple epithelium

Answer 13

Squamous - Lining vessels
Cuboidal - Covering the ovary and thyroid
Columnar - Lining intestine and gallbladder

Question 14

Pseudostratified

Answer 14

Layer of cells with nuclei at different levels, not all cells reach surface, but all touch basement membrane.
Lining trachea, bronchi and nasal cavity

Question 15

Stratified epithelium

Answer 15

Several layers, bottom layer contacts basement membrane

Question 16

Types of stratified epithelium

Answer 16

Squamous keratinised (dry) - epidermis
Squamous non-keratinised (moist) - mouth, oesophagus, larynx, vagina
Cuboidal - swat gland
Transitional - bladder
Columnar - Conjunctiva

Question 17

Types of intercellular adhesions

Answer 17

Tight/occluding
Adherent/anchoring
gap/communicating

Question 18

Tight junction

Answer 18

occluding junction
seal between adjacent cells
Maintains integrity of cell as a barrier
interaction between trans-membrane proteins

Question 19

Adherent junction

Answer 19

anchoring junction
adhesion between adjacent cells
anchoring of cytoskeleton of each cell

Question 20

Adherent/Anchoring junction types

Answer 20

Coherent - forms continuous around cell linking actin filament of adjacent cells
Desmosome - Forms small spots linking intermediate filament network to adjacent cell
Hemidesmosome - links intermediate filament of cell to basement membrane

Question 21

Gap junction

Answer 21

Communicating junction
Channels for communication between adjacent cells
Many tiny pores that permit diffusion
Present in cardiac and smooth muscle

Question 22

Apical cell surface structures

Answer 22

Microvilli
Stereocilia
Cilia

Question 23

Microvilli

Answer 23

Covers apical surface of cell
Looks like brushed border
Increase SA by 20x
None-motile

Question 24

Stereocilia

Answer 24

Lining epididymis

Increases SA

Question 25

Cilia

Answer 25

Long projections Motile Able to move to move substances

Question 26

Exocrine glands

Answer 26

Contain ducts to specific Simple glands - Unbranched Compound glands - Branched

Question 27

Mucous glands

Answer 27

Exocrine glands that produce mucus

Question 28

Serous glands

Answer 28

Exocrine glands that produce enzymes

Question 29

Endocrine glands

Answer 29

Secrete substances directly into tissue/blood