Cardiovascular Regulation and Blood Flow

Question 1

Blood Flow

Answer 1

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

Question 2

Lt Ventricle Pressure

Answer 2

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

Question 3

Artery Pressure

Answer 3

Little change due to low resistance

Question 4

Arterioles Pressure

Answer 4

80-35

Highest vascular resistance

Question 5

Capillaries, Venueles and Veins Pressure

Answer 5

Pressure continues to drop

Question 6

Pulmonary Artery Pressure

Answer 6

Increase would suggest R ventricle hypertrophy

Question 7

Venoconstriction (Radius)

Answer 7

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

Question 8

Venoconstriction (Compliance)

Answer 8

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

Question 9

Venoconstriction (Overall)

Answer 9

Increased pressure gradient w/o change in resistance

Question 10

Blood Velocity

Answer 10

Inversely proportional to CSA of vessel and viscosity

Directly proportional to radius

Question 11

Sheer Stress

Answer 11

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

Question 12

Vascular Tone

Answer 12

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

Question 13

Active Hyperemia

Answer 13

Increased blood flow to meet metabolic activity/demand

Blood flow increases with increased metabolic activity

Question 14

Reactive Hyperemia

Answer 14

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