Epithelial tissue

Question 1

There are 2 MAIN TYPES of epithelial tissue classified by ________

Answer 1

…function

Question 2

The two types of epithelial tissue

Answer 2

Membranous & Glandular

Question 3

Function of MEMBRANOUS epithelial tissue

Answer 3

(usually laid out in thin sheet)
-Protection/barrier
-Sensory = get outside info

Question 4

Function of GLANDULAR epithelial tissue

Answer 4

-Secretion (of useful substances
-Absorption (intestines –> nutrients)
-Filtration (kidneys –> waste)
-Excretion

Question 5

Another way glandular epithelium is classified

Answer 5

How the product is delivered

Question 6

Definition of gland

Answer 6

One or more cells that makes/secretes aqueous fluid

Question 7

The two types of Glandular Epithelium

Answer 7

Endocrine & Exocrine

Question 8

Glandular Epithelium [Endocrine]

Answer 8

No contact w/ exterior of body (ductless/pipeless); produce hormones
(ex: pituitary, thyroid, adrenals, pancreas)

Question 9

Glandular Epithelium [Exocrine]

Answer 9

Open to exterior of body via ducts (sweat/oil)

Question 10

Structural classifications of Epithelial Tissue:

Answer 10

Unicellular & multicellular

Question 11

Unicellular exocrine gland

Answer 11

Single cells scattered in an epithelial sheet amid cells with other functions

Question 12

Multicellular exocrine gland

Answer 12

-Most of supportive connective tissue, secretory unit, blood supply, nerves
-3 main types

Question 13

How are the types of multicellular exocrine glands classified

Answer 13

Based on changes in the gland as they release product

Question 14

3 main types of multicellular exocrine gland

Answer 14

-Merocrine gland
-Apocrine gland
-Holocrine gland

Question 15

Merocrine gland

Answer 15

-Sweat glands/cool off
-Vesicles use exocytosis to release into duct, which goes to the skin

Question 16

Definition of exocytosis

Answer 16

a process by which the contents of a cell vacuole are released to the exterior through fusion of the vacuole membrane with the cell membrane.

Question 17

Aprocrine gland

Answer 17

Shares product inside cell & piece of cell comes off so it can be released

Question 18

Holocrine gland

Answer 18

Part of gland dies to release product

Question 19

Generalizations regarding epithelial tissue

Answer 19

-Limited space btwn cells
-Basement membrane attached to membranous epithelium
-Apical surface is “free”
-Avascular (few blood vessels)
-Cells connected via desmosomes & tight junctions

Question 20

Features of APICAL surfaces of epithelium

Answer 20

Microvilli & Cilia

Question 21

Features of APICAL surfaces of epithelium [Microvilli]

Answer 21

-Finger-like extensions of cell membrane
-Increases surface area for absorption
(Ex: in small intestine)

Question 22

Features of APICAL surfaces of epithelium [Cilia]

Answer 22

-Whip-like motile tensions
-Moves mucus, etc. over surface one way
(Ex: respiratory tubes)

Question 23

Features of BASAL surface of epithelium

Answer 23

Basal lamina & Basement membrane

Question 24

Features of BASAL surface of epithelium [Basal lamina]

Answer 24

Supportive sheet btwn epithelium & underlying connective tissue
-Selective filter

Question 25

Features of BASAL surface of epithelium [Basement membrane]

Answer 25

Basal lamina + underlying reticular fiber layer
-Attaches epithelium to connective tissue below