LP #103 Difference In The Structure & Fxn Of BV

Question 1

AA & VV have 3 layers

Answer 1

• Tunica externa (adventitia)
• Tuncia media
• Tunica intima (internal)

Question 2

• outer layer
• composed of CT (collagen)
• anchors & protects bv’s
• innervated
• large bv’s are vascularized (vasa vasorum)

Answer 2

Tuncia externa (adventitia)

Question 3

• middle layer
• composed of smooth m & elastin
• regulate BF via vasoconstriction & vasodilation
• regulated by sympathetic nn

Answer 3

Tuncia media

Question 4

• endothelium lines lumen
• composed of squamous epithelium
• provide lumen w/smooth surface to decrease friction
• large bv’s are supported by a basement membrane

Answer 4

Tuncia intima (internal)

Question 5

Capillaries: Tuncia intima only?

Answer 5

• thin & very permeable

- enables quick & efficient diffusion (nutrients/O2 in & waste out)

Question 6

• 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

Answer 6

Valves

Question 7

A dilation of bv’s d/t stretching of bv walls?

Answer 7

Aneurysm

Question 8

• Location: circle of Willis
• May cause cerebral hemorrhages:
• TIA (transient ischemic attack), or
• CVA (cerebrovascular accidents)

Answer 8

Berry aneurysm

Question 9

Berry aneurysm results in?

Answer 9

• Neural dysfxn
• Severe impairment
• Coma
• Death

Question 10

• involves entire circumference of bv
• develops: gradually
• location: aorta

Answer 10

Fusiform aneurysm

Question 11

• involves only part of the bv’s circumference
• causes a sac-like deformation
• location: aorta & 1* branches

Answer 11

Saccular aneurysm

Question 12

• blood seeps b/w bv layers, causing dilation & rupture

* location: ascending aorta

Answer 12

Dissecting aneurysm

Question 13

General fxn arteries

Answer 13

Conducting/distributing

Question 14

General fxn veins

Answer 14

Blood reservoir

Question 15

Direction of blood flow arteries? & veins?

Answer 15

Arteries: carry blood away from heart

Veins: carry blood toward heart

Question 16

Aortic vessels susceptible to fusiform, saccular & dissecting d/t:

Answer 16

• large size
• elasticity
• increase P
• turbulence

Question 17

Aneurysm leading causes?

Answer 17

• arteriosclerosis

- hypertension

Question 18

*Formation d/t weakening of bv walls, caused by degeneration of bv’s elastic or smooth mm

Answer 18

Aneurysm

Question 19

Aneurysm risk factors

Answer 19

• congenital defects
• hypertension
• increase cholesterol
• elderly

Question 20

________ are dangerous d/t location & tendency to rupture- results in hemorrhage

Answer 20

Aneurysm