Histology- Epithelial Tissue

Question 1

Types of Epithelia

Answer 1

Question 2

Simple Squamous Epithelium

Answer 2

Structure: single layer of thin, flat cells

Function: thinnest possible barrier to allow for rapid diffusion and filtration, secretion in serous membranes

Location: air sacs in lungs, the lining of the lumen of blood vessels and lymph vessels, serous membranes of body cavities

Question 3

Simple Cuboidal Epithelium

Answer 3

Structure: single layer of cells

Function: absorption and secretion, forms secretory tissue of most glands and small ducts

Location: the lining of kidney tubules, thyroid gland follicles, the surface of the ovary, secretory regions, and ducts of most endocrine glands

Question 4

Nonciliated Simple Columnar Epithelium

Answer 4

Structure: single layer of nonciliated cells

Function: absorption and secretion

Location: the lining of most gastrointestinal tract

Question 5

Ciliated Simple Columnar Epithelium

Answer 5

Structure: single layer of ciliated cells

Function: secretion of mucin and movement of mucus along cilia

Location: the lining of the larger bronchioles (air passageway) tubes

Question 6

Ciliated Pseudostratified Columnar Epithelium

Answer 6

Structure: single layer of cells with varying heights, all cells connect to the basement membrane, but not all cells reach the apical surface, has goblet cells and cilia

Function: protection; secreation of mucin and movement of mucus along apical surface of epithelium by cilia

Location: lining of the larger airways of respiratory tract, including nasal cavity, part of pharynx, trachea, and bronchi

Question 7

Nonciliated pseudostratified columnar epithelium

Answer 7

Structure: single layer of cells with varying heights all cells connect to the basement membrane, but not all cells reach the apical surface, lacks goblet cells and cilia

Function: protection

Location: RARE- lining of part of the male urethra and epididymis

Question 8

Keratinized Stratified Squamous Epithelium

Answer 8

Structure: multiple cell layers, basal cells are cuboidal or polyhedral and alive, apical cells are squamous, lack a nucleus and organelles, filled with the protein keratin, and are dead

Function: protection of underlying tissue

Location: epidermis of skin

Question 9

Nonkeratinized Stratified Squamous Epithelium

Answer 9

Structure: multiple layers, basal cells are cubodial, apical cells are squamous, all cells are living, each cell has a nuclus and organelles, lacks keratin

Function: protection of underlying tissue from abrasion

Location: living of oral cavity, part of pharnyx, part of larynx, esophagus, vagina, anus

Question 10

Stratified Cubodial Epithelium

Answer 10

Structure: two or more layers of cells

Function: protection and secreation

Location: ducts of most exocrine glands and ovarian follicles

Question 11

Stratified Columnar Epithelium

Answer 11

Structure: two or more layers of cells

Function: protection and secreation

Location: large ducts of salivary glands, conjunctiva covering the eye, membranous part of male urethra

Question 12

Transitional Epithelium

Answer 12

Structure: apperance varies depending on the tissue (relaxed or stretched), mix of cubodial and columnar

Function: accommodates urine volume changes, uterus, and part of urethra

Location: lining of urinary bladder, uterus, and part of urethra

Question 13

Tissue Locations

Answer 13