Quiz 2 - Epidermis Flashcards Preview

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Flashcards in Quiz 2 - Epidermis Deck (18):
1

functions of integumentary system

protection
body temperature regulation
cutaneous sensations (touch and pressure receptors)
metabolic functions (ex: vitamin D)
excretion
immune response

2

structure of integumentary system

layers: epidermis, dermis, hypodermis

3

epidermis

stratified, squamous epithelium (keratinized), avascular

4

layers of epidermis (BSGLC)

stratum basale
stratum spinosum
stratum stratum granulosum
stratum lucidum
stratum corneum

5

stratum basale

deepest layer; single row of cells
- keratinocytes
- basal cells
- merkel cells
- melanocytes

6

keratinocytes

epithelial cells that produce keratin

7

basal cells

rapid dividing stem cells, replace superficial keratinocytes at epithelial surface

8

merkel cells

associated closely with a sensory nerve ending

9

melanocytes

produce melanin

10

melanin

pigment that creates a "shield" to protect keratinocytes nucleus from UV radiation damage

11

stratum spinosum

"spiny" layer - several cell layers think, keratinocytes contain protein filaments that cross-link to adjacent cells
- langerhan's (dendritic) cells

12

langerhan's cells

initiates immune response against pathogens

13

stratum granulosum

(granular layer) - thin; 3-5 cell layers of flattened keratinocytes
- keratohyaline
- membrane bound granules

14

keratohyaline

granular protein that surrounds keratin filaments

15

membrane-bound granules

causes cells to be water resistent

16

stratum lucidum

(clear layer) - thin, transparent band, few rows of flattened dead keratinocytes

17

stratum corneum

outermost layer of many layers of dead cells (layers continually shed and replaced)
- keratinization

18

keratinization

coating of the surface of cells