WEEK 3: Epithelial Tissues (Laboratory)

Question 1

Types of Epithelia. Cells of covering epithelia are organized into one or more layers that cover the surface or line the cavities of an organ.

Answer 1

Covering or Lining Epithelia

Question 2

Common types of covering epithelia.

Function: Facilitates the movement of the viscera (mesothelium), active transport by pinocytosis (mesothelium and endothelium), secretion of biologically active molecules (mesothelium)

Distribution: Lining vessels (endothelium); Serous lining of cavities; pericardium, pleura, peritoneum (mesothelium)

Answer 2

Simple Squamous Epithelium

Question 3

Common types of covering epithelia.

Function: Covering, secretion

Distribution: Covering the ovary, thyroid

Answer 3

Simple Cuboidal Epithelium

Question 4

Common types of covering epithelia.

Function: Protection, lubrication, absorption, secretion.

Distribution: Lining of intestine, gallbladder

Answer 4

Simple Columnar Epithelium

Question 5

Abundant in the lining of the small intestine and respiratory tract, which secretes lubricating mucus that aids the function of these organs.

Answer 5

Goblet cell

Question 6

Common types of covering epithelia.

Function: Protection; prevents water loss

Distribution: Epidermis

Answer 6

Stratified Squamous keratinized (dry) Epithelium.

Question 7

Common types of covering epithelia.

Function: Protection, secretion; prevents water loss

Distribution: Mouth, esophagus, larynx, vagina, anal canal

Answer 7

Stratified Squamous nonkeratinized (moist) Epithelium

Question 8

Common types of covering epithelia.

Function: Protection, secretion

Distribution: Sweat glands, developing ovarian follicles

Answer 8

Stratified Cuboidal Epithelium

Question 9

Common types of covering epithelia.

Function: Protection, distensibility

Distribution: Bladder, ureters, renal calyces

Answer 9

Transitional Epithelium or Urothelium (urinary tract)

Question 10

Common types of covering epithelia.

Function: Protection

Distribution: Conjunctiva lining the eyelids

Answer 10

Stratified Columnar Epithelium

Question 11

Common types of covering epithelia.

Function: Protection, secretion; cilia-mediated transport of particles trapped in mucus out of the air passages.

Distribution: Lining of trachea, bronchi, nasal cavity

Answer 11

Pseudostratified Epithelium

Question 12

Types of Epithelia. Are formed by cells specialized to secrete. Molecules to be secreted are generally stored in the cells in small membrane-bound vesicles called secretory granules.

Answer 12

Glandular Epithelia

Question 13

Glandular Epithelia. Remain connected with the surface epithelium, the connection forming the tubular ducts lined with epithelium that deliver the secreted material where it is used.

Answer 13

Exocrine glands (with ducts)

Question 14

Glandular Epithelia. Lose the connection to their original epithelium and therefore lack ducts.

Answer 14

Endocrine gland (w/o ducts)

Question 15

Exocrine Gland (w/ ducts). Contains the cells specialized for secretion.

Answer 15

Secretory portion

Question 16

Exocrine Gland (w/ ducts). Transport the secretion out of the gland.

Answer 16

Ducts

Question 17

Based on release of secretory products. This is the most common method of protein or glycoprotein secretion and involves typical exocytosis from membrane-bound vesicles or secretory granules.

Answer 17

Merocrine secretion (Sweat glands, Salivary glands)

Question 18

Based on release of secretory products. Involves the cell filling with secretory product and then the whole cell being disrupted and shred (Sebaceous glands)

Answer 18

Holocrine secretion

Question 19

Based on release of secretory products. Secretory product is typically a large lipid droplet and is discharged together with some of the apical cytoplasm and plasmalemma (Mammary gland)_

Answer 19

Apocrine secretion

Question 20

Exocrine glands with merocrine secretion can be further categorized as. Watery secretions.

Answer 20

Serous

Question 21

Exocrine glands with merocrine secretion can be further categorized as. Thick secretions (mucin)

Answer 21

Mucous

Question 22

Endocrine Gland (w/o ducts). Producers of hormones. Diffuse into the blood for circulation and bind specific receptors on target cells elsewhere in the body.

Answer 22

Paracrine

Question 23

Endocrine Gland (w/o ducts). Producers of hormones. Cells very close to the hormone-secreting cells or on the secreting cell itself.

Answer 23

Autocrine