Cardiovascular Regulation and Blood Flow Flashcards Preview

PTRS 825 Final Exam > Cardiovascular Regulation and Blood Flow > Flashcards

Flashcards in Cardiovascular Regulation and Blood Flow Deck (14)
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1

Blood Flow

Increased with exercise - support skeletal muscle
Constant workload - stabilizes
Incremental workload - linear increase

2

Lt Ventricle Pressure

0-120 (0 - relaxation, 120 - contraction)

3

Artery Pressure

Little change due to low resistance

4

Arterioles Pressure

80-35
Highest vascular resistance

5

Capillaries, Venueles and Veins Pressure

Pressure continues to drop

6

Pulmonary Artery Pressure

Increase would suggest R ventricle hypertrophy

7

Venoconstriction (Radius)

Not reduced
Little change in resistance
Low to accommodate large volume of blood

8

Venoconstriction (Compliance)

Decreased -> increased pressure in veins to increase return to heart

9

Venoconstriction (Overall)

Increased pressure gradient w/o change in resistance

10

Blood Velocity

Inversely proportional to CSA of vessel and viscosity
Directly proportional to radius

11

Sheer Stress

Friction of BF/viscosity of blood on endothelial cells
Vasodilation - increased
Vasoconstriction - decrease
Impact on HTN and Marfan's

12

Vascular Tone

Degree of constriction of blood vessel relative to max dilated state
Under SNS and PNS control
Brain/kidney - less tone

13

Active Hyperemia

Increased blood flow to meet metabolic activity/demand
Blood flow increases with increased metabolic activity

14

Reactive Hyperemia

Blood flow is transiently increased following period of ischemia
Degree and duration of increased flow proportional to duration of occlusion