Micocirculation

Question 1

Average velocity of blood through capillaries is depedent upon

Answer 1

Arteriole constriction
Venule pressure
Endothelial and local factors

Question 2

Salutes move across the capillary wall via

Answer 2

Diffusion, filtration, and pinocytosis

Question 3

Average velocity though capillaries is

Answer 3

1 mm/s

Question 4

Fick principle

Answer 4

Trans capillary effluent rate (mass/time) = flow (Q) [(arterial concentration [X]) - (venous concentration)]

Question 5

Factors (Starling Forces) driving fluid filtration

Answer 5

Hydrostatic or blood pressure within the capillary

Interstitial protein oncotic pressure

Question 6

Factors driving fluid pressure

Answer 6

Interstitial fluid pressure

Plasma protein oncotic pressure

Question 7

Effect of increases arteriolar resistance on capillary pressures

Answer 7

Increases resistance to inflow
Decreased capillary flow
decreases capillary hydrostatic pressure
Increases reabsorption 
Decreased mean capillary pressure

Question 8

Effect of increases venous pressure/increased venous resistance

Answer 8

Decreased pressure gradient (P1-P2); increases resistance to outflow
Increased capillary hydrostatic pressure
Increased filtration
Extreme example – edema formation cardiac failure
Increased mean capillary pressure

Question 9

Lymph system

Answer 9

In direct contact with interstitial space allowing free flow of large molecules
Valves allow for unidirectional flow
Maintains low. Interstitial hydrostatic an oncotic pressures

Question 10

Dehydration effect on capillary filtration/reabsorption

Answer 10

Decreased mean capillary pressure