Histology: epithelium

Question 0

Epithelial Tissue:

Answer 0

Covers exposed surfaces and lines body cavaties

Always a vascular (no blood vessels)

Question 1

4 Basic Tissue Types:

Answer 1

1. Epithelium
2. Connective
3. Muscle
4. Nervous

Question 2

Connective tissue:

Answer 2

Protects, supports and interconnects body parts and organs

Cells, protein fibers and ground substance

Question 3

Muscular tissue:

Answer 3

Produces movement

Question 4

Nervous tissue

Answer 4

Conducts impulses for internal communication.

Question 5

Histology:

Answer 5

The study of microscopic tissues

Question 6

3 types of cell junctions

Answer 6

1. Tight
2. Gap
3. Desmosomes

Question 7

Tight junctions

Answer 7

Fused by membranes- reduces ability of molecules to pass between them.
Encircles cells

Question 8

Gap junctions:

Answer 8

Directly connected by cytoplasm- allows molecules, ions & electrical impulses to pass
Tunnel like

Question 9

Desmosomes junctions

Answer 9

Button- like; binds cells together & act like an anchor
Only at stress points

Hemidesmosomes attach cell base to basement membrane (PAC man bite to connect)

Question 10

4 characteristics of epithelial tissue

Answer 10

1. Cellular
2. Polar
3. Basement membrane
   4.

Question 11

3 ways to classify epithelial tissue

Answer 11

1. # of layers
2. Cell shape
3. Surface

Question 12

3 types of epithelial layered tissue

Answer 12

1. Simple
2. Stratified
3. Pseudo stratified

Question 13

Simple epithelial

Answer 13

One layer thick

Question 14

Stratified epithelial:

Answer 14

More than one layer thick

Question 15

Pseudo stratified:

Answer 15

Looks like many layers - but really only one layer. Look at basement membrane to identify these.

Question 16

4 shapes of epithelia:

Answer 16

1. Squamous
2. Cuboidal
3. Columnar
4. Transitional

Question 17

Squamous

Answer 17

Flattened

Question 18

Cuboidal

Answer 18

Talk as wide

Round nucleus

Question 19

Columnar

Answer 19

Taller than wide

Elongated nucleus

Question 20

Transitional

Answer 20

Change shape from cuboidal to squamous Dome top

Question 21

4 surface modifications of epithelia:

Answer 21

1. Cilia
2. Micro villi
3. Keratinization
4. Goblet cells

Question 22

Cilia

Answer 22

Hair like on apical surface

Question 23

Micro villi

Answer 23

Finger like projects of plasma membrane

Question 24

Goblet cells

Answer 24

Shaped like a goblet- secrete mucus

Question 25

Keratinization:

Answer 25

Process where epithelial tissue loses it's moisture-- typically the top layer of skin Keratinized: No nuclei, Lots of layers, Dry Non Keratinized: Nuclei, lots of layers, moist

Question 26

Simple squamous

Answer 26

Air sacs in lungs

Question 27

Simple cuboidal

Answer 27

Kidney tubules

Question 28

Stratified squamous

Answer 28

Keratinzed: Epidermis of skin NonKeratinized: Oral cavity *lots of layers *look at nuclei on top and work down :)

Question 30

Simple columnar

Answer 30

Ciliated: uterine tubes | Non Ciliated: GI tract

Question 31

Stratified cuboidal

Answer 31

Male uretha | *2-3 layers max

Question 32

Stratified columnar

Answer 32

Male uretha * no cilia * rare * 2-3 layers max

Question 33

Pseudo stratified

Answer 33

Make uretha * cilia * look at basement membrane to identify these :)

Question 33

How to name epithelial tissue

Answer 33

Include # of layers, cell shape

Question 34

Transitional

Answer 34

Bladder | *dome shaped @ top, bi-nucleated. round nuclei

Question 35

Adhering junction

Answer 35

Strengthening belt, passageway between cells | Red rover connection

Question 36

Keratin:

Answer 36

A fibrous protein- provides a protective barrier of epidermis skin.

Question 37

Glands:

Answer 37

Endocrine:(in) Lacks ducts- molecules secreted stay within body Exocrine:(out) Ducts- secreted out into lumens

Question 38

Secretion methods:

Answer 38

Merocrine glands: small punts at a time Holocrine glands: fill up & release all at once Apocrine glands: medium release speed and refill speed

Question 39

Fibers of connective tissue

Answer 39

Collagen: strong, flexible, white Elastic: coiled structure, stretches easy, yellow Reticular: collagen protein subunit arranged differently, coated with glycoproteins