LP #103 Difference In The Structure & Fxn Of BV Flashcards
1
Q
AA & VV have 3 layers
A
- Tunica externa (adventitia)
- Tuncia media
- Tunica intima (internal)
2
Q
- outer layer
- composed of CT (collagen)
- anchors & protects bv’s
- innervated
- large bv’s are vascularized (vasa vasorum)
A
Tuncia externa (adventitia)
3
Q
- middle layer
- composed of smooth m & elastin
- regulate BF via vasoconstriction & vasodilation
- regulated by sympathetic nn
A
Tuncia media
4
Q
- endothelium lines lumen
- composed of squamous epithelium
- provide lumen w/smooth surface to decrease friction
- large bv’s are supported by a basement membrane
A
Tuncia intima (internal)
5
Q
Capillaries: Tuncia intima only?
A
- thin & very permeable
- enables quick & efficient diffusion (nutrients/O2 in & waste out)
6
Q
- Major structural adaption
- open & close compartments to aid flow of fluids
- Found in heart, vv & lymph vessels
- Prevent backflow & ensure 1-way flow w/minimal turbulence
A
Valves
7
Q
A dilation of bv’s d/t stretching of bv walls?
A
Aneurysm
8
Q
- Location: circle of Willis
- May cause cerebral hemorrhages:
- TIA (transient ischemic attack), or
- CVA (cerebrovascular accidents)
A
Berry aneurysm
9
Q
Berry aneurysm results in?
A
- Neural dysfxn
- Severe impairment
- Coma
- Death
10
Q
- involves entire circumference of bv
- develops: gradually
- location: aorta
A
Fusiform aneurysm
11
Q
- involves only part of the bv’s circumference
- causes a sac-like deformation
- location: aorta & 1* branches
A
Saccular aneurysm
12
Q
- blood seeps b/w bv layers, causing dilation & rupture
* location: ascending aorta
A
Dissecting aneurysm
13
Q
General fxn arteries
A
Conducting/distributing
14
Q
General fxn veins
A
Blood reservoir
15
Q
Direction of blood flow arteries? & veins?
A
Arteries: carry blood away from heart
Veins: carry blood toward heart
