L8: Epithelial Tissue (onaizi)

Question 1

“A diverse group of cells with an ordered structure working together for a common function”

Shnu hatha?

Answer 1

Tissue

Question 2

What are the 4 types of tissue?

Answer 2

1. Epithelial - the lining of our body
2. Connective
3. Muscle
4. Nervous

Question 3

What are the basic characteristics of epithelial tissue?

Answer 3

1. Covers body surface
2. Lines body cavities
3. Forms glands
4. Highly regenerative
5. Avascular

Question 4

Shlon shakl il epithelial tissue?

Answer 4

Closely packed cells- has little extracellular surface

Cells are joined by specialized cell-to-cell junctions

Question 5

What are the glands that epithelial tissue forms?

Answer 5

Skin
Airways
Digestive lining
Urinary tract lining

Question 6

Which tissue type is avascular?

Answer 6

Epithelial tissue

(Haman cartilage)

Question 7

Describe the basement membrane of epithelial tissue

Answer 7

• Separates epithelium from underlying connective tissue
• It is a non-cellular membrane comprised
of polysaccharide rich membrane apical surface
• Acts as a sieve to prevent materials from
entering the body

Question 8

Epithelial tissue:

Free surface is the ________ and the bound
surface is the ________ side

Answer 8

apical side

basolateral

Question 9

What are some of the functions of the epithelial tissue?

Answer 9

Question 10

Some epithelial cells, based on their location, have
specialized cells on them to help them carry out their functions

Give me some examples of these specialized cells and their functions:

Answer 10

Question 11

Name:

1. The different cell shapes and layers in epithelial tissue
2. The surface specialization of each of these cell shapes

Answer 11

Question 12

Compare cilia and microvilli

Answer 12

Question 13

Where do you find simple squamous epithelium in the body?

Answer 13

1. Makes up the alveoli (air sacs of the lung)
2. Makes up the lining of all blood vessels and capillaries (endothelium)
3. Make up various membranes within the body (peritoneum)
4. Glomerulus of kidney

simple, flat cells lining the alveoli/endothelium helps with quick oxygen/gas/co2 exchange-diffusion

Question 14

Where do you find simple cuboidal epithelium?

Answer 14

It makes up the collecting (dnt forget it helps with absorption) tubules of the:
1. Kidney
2. Liver
3. Pancreas
4. Thyroid
5. And other glands of the body

= synthesis of hormones

Question 15

Where do you find simple columnar ciliated? + why is it in that structure?

Answer 15

It makes up the lining of the ovary ducts (fallopian tube)

It helps with motility; y7arik il sperm

ONLY FOUND IN THE FEMALE REPRODUCTIVE TRACT

Question 16

Where do you find simple columnar microvilli epithelium with goblet cells?

W laish fee goblet cells?

Answer 16

It is found in the GI tract/lining of the intestine

Fe goblet cells to secrete mucus

Question 17

Where do you find stratified squamous epithelium?

Answer 17

In areas of the body prone to abrasion:
keratinizing: skin
non keratinizing: oral cavity, esophagus, vaginal wall, anal canal

Question 18

Where do you find keratinizing and non-keratinizing stratified squamous epithelium?

Answer 18

Keratinizing stratified squamous epithelium: skin

Non-Keratinizing stratified squamous epithelium: tongue, oral mucosa, esophagus, vagina, anal canal

Question 19

What is keratin? (Its composition and its function)

Answer 19

Dead skin cells that change their morphology and are purely composed of a protein that acts as a protective barrier (for example bl skin)

Question 20

Where do you find stratified cuboidal epithelium?
W shnu its function?

Answer 20

• found in: Sweat glands, salivary glands, ovarian follicles and seminiferous tubules

It has a similar role to simple cuboidal cells, which is secretion: Secretes sweat, ovarian hormones and sperm

Photomicrographs in high magnification show Stratified cuboidal epithelium found in sweat glands

Question 21

Which type of epithelial tissue is rare?

Answer 21

Stratified columnar epithelium

Question 22

Epthelia are classified according to cells…..?

Answer 22

nearest to the lumen (so the apical surface)

Question 23

Where is stratified columnar epithelium located?

Answer 23

Located in the largest ducts of salivary glands:
1. parotid
2. submandibular

The basal layer of cells are cuboidal cells and the layer nearest the apical surface includes columnar cells. The large droplets are mucus, in Goblet cells.

Question 24

What is the main role of goblet cells?

Answer 24

To secrete mucus

Question 25

Where do u find pseudo stratified columnar ciliated epithelium with goblet cells?

Shnu its function?

Answer 25

• Makes up the lining of the respiratory tract

Functions:
1. Secretes mucus
2. Moves mucus
3. Traps foreign particles

Question 26

In which layer does cell division/nourishment come from in epithelial cells?

Answer 26

They come up from the basal level, whereas in transitional cells yee mn the top layer

Question 27

Where do you find transitional epithelium?

Shnu il characteristics?

Answer 27

Found in: lining of the bladder and the ureter

Characteristics:
1. Can expand and distend
2. Bi-nucleated cells (cells are dividing)
3. Multi layered/ stratified
4. Top layer cuboidal + bottom layer mixed

Question 28

Question 29

What type of epithelial cells make up the upper respiratory tract

Answer 29

Pseudo-stratified columnar ciliated epithelium

(stereocilia is in the epididymis based on the lab notes, dont mix them up)

Question 30

Is stereocilia a type of cilia? And are they motile?

Answer 30