int Flashcards
1
Q
Components of the Integumentary System
A
2
Q
Functions of the Int System
A
- physical and immunological protection
- thermoregulation (sweat glands and insulation)
- sensation
- metabolic functions (Vit D synthesis and stores energy as subcutaneous fat)
3
Q
Composition
A
Composed of all four tissue types:
- Epithelium
- Connective Tissue
- Muscle
- Nerve
4
Q
Epithelium in Skin (2)
A
covers surface and forms boundary
5
Q
Connective Tissue in Skin (2)
A
supports epithelium, provides strength and resiliency
6
Q
Muscle in IS (2)
A
controls diameter of blood vessels, adjusts position of hairs
7
Q
Nerve Tissue in IS (3)
A
controls smooth muscles, generates sensation, stimulates glands
8
Q
Skin - size/weight
A
largest organ system of body:
- ~2 sq meters or 22 sq feet
- 15% body weight
- thickness from 0.5 mm to 4.0 mm
- average thickness 1 - 2 mm
9
Q
A
10
Q
A
11
Q
A
12
Q
Stratum Germinativum - aka? composed of? attached to?
A
- aka stratum basal (b/c it’s the basal layer, job is to continuously divide)
- large basal cells
- firmly attached to basal lamina (which is attached to CT)
13
Q
basal cells
A
stem cells that divide to give rise to new keratinocytes (found in stratum germinativum/basal)
14
Q
Stratum Spinosum - composed of?
A
- “spiny” layer
- composed of keratinocytes
- where cells are first called keratinocytes
15
Q
Keratinocytes
A
- first called in stratum spinosum
- contain bundles of tonofilaments (intermediate filaments, attach to desmosomes)
- desmosomes attach keratinocytes together
- keratinocytes still capable of division