Epithelial Tissue

Question 1

Is epithelia vascular or avascular

Answer 1

Avascular

Question 2

Tight junction location and proteins involved

Answer 2

Encircle cells near the most apical surface

Occludins, claudins

Question 3

Adherins

Answer 3

Lateral adhesions involving cadherins that interact with actin

Question 4

Desmosomes

Answer 4

Lateral adhesions involving cadherins that interact with intermediate filaments

Question 5

Hemidesmosomes

Answer 5

Basal adhesions involving integrins and intermediate filaments that anchor to basal lamina

Question 6

Bacteria that cause food poisoning target what

Answer 6

Tight junctions in the intestin

Question 7

Pemphigus vulgaris

Answer 7

Autoimmune disease leading to abnormal desmosome function, reduces cell-cell adhesion and causes blisters of oral mucosa

Question 8

Microvilli

Answer 8

Cytosolic processes with an actin core

Specialized for absorption, increase surface area 20-30x

Question 9

Celiac disease

Answer 9

Loss of microvilli on absorptive cells in SI

Question 10

Stereocilia

Answer 10

Microtubule structure with actin core
Increase surface area
Longer and less mobile than microvilli
Found in epididymis and hair cells of inner ear

Question 11

Cilia structure, 3 types of cilia

Answer 11

Highly motile structure containing arrays of microtubules
3 types- motile, primary and nodal
Motile- propel substances across the tissue
Primary- immotile, function as chemosensors/mechanosensors/osmosensors
Nodal- embryonic, have role in L/R axis determination

Question 12

Simple squamous location/function

Answer 12

Lining of blood and lymphatic vessels (endothelium), lining of serous membranes (mesothelium), lining alveoli in lungs, loop of henle
Exchange, barrier, lubrication

Question 13

Simple cuboidal location/function

Answer 13

Kidney tubules, glands & associated ducts, terminal bronchioles, covering of he ovary
Absorption, barrier, secretion

Question 14

Simple columnar location/function

Answer 14

Auditory tubes, uterus, oviducts, stomach, SI/LI, gallbladder
Absorption/secretion

Question 15

Pseudostratified columnar ciliated location function

Answer 15

Lining of nasal cavity, pharynx, trachea, bronchi

Absorption/secretion, debris and particulate movement

Question 16

Urothelium location/function

Answer 16

Urinary bladder, ureters, urethra

Barrier, distensible property

Question 17

Non keratinized stratified squamous location/function

Answer 17

Oral cavity, portions of pharynx, esophagus, anus, vagina, urethra, cornea
Barrier and protection

Question 18

Keratinized stratified squamous location/function

Answer 18

Epidermis of skin

Barrier and protection

Question 19

Stratified cuboidal location/function

Answer 19

Sweat glands/ducts, ovarian follicles, salivary gland ducts

Barrier and passageway

Question 20

Serous membrane examples

Answer 20

Peritoneum, pericardium, pleura

Question 21

Unicellular gland example

Answer 21

Goblet cells- line respiratory tract and intestines

Question 22

Exocrine gland

Answer 22

Multicellular glands comprised of secretory cells grouped as an acinus

Question 23

Parotid glands are composed of

Answer 23

Serous acini

Question 24

Sublingual glands are composed of

Answer 24

Mucous acini

Question 25

Submandibular glands are composed of

Answer 25

Serous, mucous and seromucous acini

Question 26

Merocrine vs holocrine vs apocrine

Answer 26

Merocrine- secretion is delivered in membrane bound vesicles to apical surface & undergo exocytosis
Holocrine- Secretion accumulates, apoptosis occurs, secretory products and debris released
Apocrine- Release of apical portion of cell