Capillary Exchange

Question 1

Capillary adaptations due to Ficks Law (3)

Answer 1

1) Large conc gradient = (Constant blood flow through capillaries)
2) Large area available for diffusion = (Many capillaries supply the same tissue)
3) Short diffusion distance (Endothelium = one layer thick)

Question 2

How is resistance reduced?

Answer 2

One capillary has relatively large resistance (reduced due to lots of capillaries)

Question 3

Name sterlings laws? (4)

Answer 3

Blood Hydrostatic Pressure
Blood Colloid Pressure
Interstitial Hydrostatic Pressure
Interstitial Colloid Pressure

Question 4

Blood Hydrostatic Pressure?

Answer 4

Pressure exerted by blood against capillary wall

PUSHES fluid OUT of capillary

Question 5

Blood Colloid Pressure?

Answer 5

Pressure exerted by proteins in the blood against capillary wall (mostly albumin)
Usually too large to diffuse into interstitium
PULLS fluid INTO capillary

Question 6

Interstitial Hydrostatic Pressure?

Answer 6

Pressure of fluid in interstitium

PUSHES fluid INTO capillary

Question 7

Interstitial Colloid Pressure

Answer 7

Pressure of proteins in interstitium

PULLS fluid OUT of capillary