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Flashcards in Chap 1 Part 2 Deck (40)
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1

What kind of epithelium is two or more cell layers thick?

stratified epithelium

2

What kind of function is shared by all stratified epithelium>?

protection

3

Stratified Squamous epithelium have multiple layers of cells that tend to flatten out from basal layer to superficial layer. Where can this type of epithelium be found?

esophagus, oral cavity, tongue and vagina

4

Although stratified squamous epithelium protects against abrasion, is protection is limited. Why? What are its limitations?

limited thickness; no protection from drying

5

What is the function of Keratinized Stratified Squamous epithelium?

Protection in a dry environment

6

What are the layers in epithelium of skin?

stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, stratum corneum (Boys Seldom Get Lucky Consistently)

7

Which layer of the keratized stratified squamous is composed of 1-2 layers of keratinocytes which are mitotic and closest to the dermis?

stratum basale (germinativum)

8

Which layer of the keratinized stratified squamous is composed of multiple layers of "spiny shaped" keratinocytes? Thickness of this layer can vary.

Stratum Spinosum

9

Which layer of the keratinized stratified squamous can be described as the uppermost 2-5 layers of flattened living keratinocytes where exocytosis of lipid-filled lamellar granules will occur?

stratum granulosum

10

Which layer of the keratinized stratified squamous is not easy to see, present only in thick skin, and is a thin layer of recently dead or dying keratinocytes?

stratum lucidum (nucleus and organelles are not present)

11

Which layer of the keratinized stratified squamous is composed of dead cells, karatin, and lipids? It also has 3 distinct functions.

stratum corneum

12

What are the 3 functions of the stratum corneum?

prevents water loss, barrier to microbes, and protects against abrasion

13

T/F: thickness varies in the stratum corneum and stratum spinosum.

True

14

What is the the Malpighian layer?

stratum basale and stratum spinosum; a way of grouping layers together where cell division can occur

15

How do epidermal pegs (rete ridges) and dermal papillae contribute to the strength of epithelium?

increase surface area for attachment of the epithelium to the CT below

16

How long do epithelial cells live?

about 28 days

17

Melanocytes do what and are found where?

protect against UV radiation; stratum basale

18

What occurs with increased UV light exposure (with regard to melanocytes)?

skin color greatly influenced; melanocytes increase, increasing melanin

19

T/F: melanocytes are about equal in all humans.

True

20

Which type of cell recognizes external foreign antigens, is an epidermal dendritic cell, a resident APC, and is found in the stratum spinosum?

Langerhans Cells

21

Which type of cell provides touch receptors, is associated with free nerve endings (very numerous in areas of high sensitivity) and is found in the stratum basale layer?

Merkel cells (fingertips and hair follicles)

22

T/F: Melanocyte numbers decrease with repeated UV exposure.

False; this is true of Langerhans cells, melanocyte numbers increase

23

What are the 5 types of stratified epithelium?

stratified squamous, keratinized stratified squamous, stratified cuboidal, stratified columnar, and transitional

24

Which types of stratified epithelium function in protection?

all of them

25

Where can you find stratified cuboidal? how many layers?

larger in ducts in sweat glands and salivary glands; 2 layers (basal layer is flattened and superficial is cuboid

26

Wher can stratified columnar be found?

large ducts in pancreas, parts of male urethra and conjunctiva of the eye

27

T/F: stratified columnar epithelium is very rare, and consists of two layers. The basal layer is flattened and the superficial is columnar in shape.

True

28

Other than protection, what function does stratified columnar perform?

provides a transition between epithelial types

29

What/where is transitional epithelium?

Urinary epithelium or urothelium; found in most of urinary tract

30

Other than protection, what function is transitional epithelium specialized to do?

stretch