Blood vessels Flashcards
1
Q
feat. of cap.
A
- simple squamous and basement membrae rolled into tube
2
Q
what are pericytes
A
contractile cells embedded in basement membrane
- modulate local blood flow
3
Q
3 types of caps. and their permiability
A
- continuous - unbroken cytoplasm
- fenestrated - openings with diaphragms
- sinusoidal - wider and more permiable
4
Q
Features of lymph caps,
A
- no basement membrane
- blind ending
- no pericytes
- endothelial cells overlap to create valves - pressure
5
Q
3 layers of larger vessels
A
- tunica intima - inner
- tunica media - middle
- tunica adventitia - outer
6
Q
2 parts of tunica intima
A
- endothelium - simple squamous lining
2. subendothelial CT - support endothelium, may have elastin
7
Q
feat. of tunica media
A
- smooth muscle
- can proliferate and creat ECM
- have elastin protein
8
Q
feat. of tunica adventitia
A
- loose CT that anchor vessel to surrounding tissue
- may have small vessels name vaso vasora
9
Q
4 diffs. between arteries and veins
A
- art. have thicker walls
- art. have think media
- vein have thick adventitia
- veins have valves
10
Q
reason for valves in veins
A
low pressure
11
Q
diffs in arterioles (3)
A
- thin adventitia
- only 2 layers of smooth
- no internal elastic
12
Q
diffs. in venules
A
- little media
- thick adventitia
- tissue site of fluid production
- in lymph have cuboidal endothelium
