Chapter 5 Part 2 Flashcards Preview

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Flashcards in Chapter 5 Part 2 Deck (39):
1

Located on thin skin- root plexuses are touch receptors - protect scalp from uv Ryas and decrease heat loss- consist of dead Keratinzed cells

Hairs

2

Superficial portion above skin -root; deeper portion penetrates skin

Shaft/root

3

Raises hairs causing "goose bumps"

Arrector pilli muscles

4

Surrounds hair root

Hair follicle

5

Base of hair follicle, contains matrix, site of cell division

Bulb (hair)

6

Partial or complete hair loss

Alopecia

7

Develop from stratum basale of epidermis

Skin glands

8

Associated with hairs in thin skin -absent in thick skin- secrete sebun (oil) preventing dryness -increased activity may cause acne

Sebaceous glands

9

3-4 million in body -release sweat onto skin surface -eccrine glands; regulate body temperature

Sudoriferous (sweat) glands

10

Mainly located in Axilla and produce a more viscous secretion

Apocrine glands

11

Located in external ear produce cerumen (ear wax)

Ceruminous glands

12

Tightly packed, dead, Keratinized epidermial cells

Nails

13

Visible portion

Nail body

14

Whitish, crescent shaped portion

Lunula

15

Site of cell division

Nail matrix

16

Located in palms,Palmer surface of digits and soles

Thick (hairless) skin

17

Lack stratum lucidum

Thin (hairy) skin

18

Controls body temperature by negative feedback

Thermoregulation

19

Lowers body temp

Sweating

20

Conserve body heat

Constrictions of blood vessels in dermis

21

Blood reservoir; store 8 to 10% of blood at rest in and adult- protection;barrier to microbes and chemicals -sensation; sense stimuli -excretes and absorbs substances -produces vitamin D

Skin functions

22

Only involves epidermis and does not bleed- stratum cells break contact with basement membrane and start migrating towards each other

Superficial wound

23

Stops the migration of cells once they contact one another

Contact inhibition

24

Stops the migration of cells once they contact one another

Contact inhibition

25

Wound extends beyond epidermis

Deep wound

26

Inflammatory, migratory,proliferative, maturation

Deep wound healing 4 phases

27

Blood clot forms and vasodilation increase delivery of phagocytic cells

Inflammatory

28

Clot forms scab and fibroblasts begin forming scar tissue

Migratory

29

Extensive deposits by fibroblasts

Proliferative

30

Scab falls off and epidermis restored

Maturation

31

Scar tissue formation occurs

Fibrosis

32

Usually contains more fibers,fewer blood vessels, hair and skin glands

Scar tissue

33

Most common type, rarely metastasize and usually harmless

Basal cell carcinoma

34

Usually develops from existing damaged tissue

Squamous cell carcinoma

35

Rarest and most deadly

Malignant melanoma

36

Age, skin type, sun exposure and family history

Risk factors

37

Graded according to serverity

Burns

38

Usually not apparent until late 40's -decrease number of langerhans cells and sebeceous glands -decreased sweat production -decreased number of functional melanocytes resulting in gray hair

Aging

39

Accessory structures

Hair,glands,nails