Question

In accordance with the physical laws governing filtration and osmosis, which of the following statements is true?

a. blood husrostatic pressure temds to draw fluid into thr capillaries from the interstitial fluid

b. interstitial fluod hydrostatic pressure tends to force fluid out of the capillaries and into the interstitial fluid

c. blood colloid osmotic pressure tends to draw fluid back into the capillaries

d. Interstitial fluid colloid pressure tends to draw fluid into the capillaries from the interstitial fluid

Answer 1

Colloid osmotic pressure is the pressure exerted by the proteins causing a relatively water deficit at that site.

Hydrostatic pressure is the pressure exerted when the water concentration rises at that site.

And we know that in the process of diffusion, a substance moves from higher concentration to lower concentration. So, the colloid osmotic pressure will tend to balance the protein concentration. Therefore it will start pulling out the fluid into that site.

Hydrostatic pressure in order to balance water concentration, will start throwing blood to the other site to decrease the water concentration at that site.

Therefore, interstitial hydrostatic pressure will throw out the fluid into capillaries.

Interstitial colloid osmotic pressure tend to pull fluid into the interstitium from the capillaries.

Hydrostatic pressure of blood capillaries will throw out the fluid into the interstitium.

Colloid osmotic pressure of blood capillaries will attract the fluid into the capillaries from the interstitium.

Only option C is correct.