Question

Why is a salt solution rather than pure water is used as an external solution for Artificial kidney dialysis

Answer 1

Answer:

nicity is a measure of the effective osmotic pressure gradient (as defined by the water potential of the two solutions) of two solutions separated by a semipermeable membrane. In other words, tonicity is the relative concentration of solutions that determine the direction and extent of diffusion. It is commonly used when describing the response of cells immersed in an external solution. Unlike osmotic pressure, tonicity is influenced only by solutes that cannot cross the membrane, as only these exert an effective osmotic pressure. Solutes able to freely cross the membrane do not affect tonicity because they will always be in equal concentrations on both sides of the membrane.

Answer 2

Explanation:

Salt solution or 0.9% NaCl solution is used during artificial kidney dialysis rather than pure water. It is because this solution is isotonic with the concentration of our blood.

We can't use normal water ( less concentrated than blood ) or more concentrated solution than blood, as it may result in the process of osmosis and destroy RBCs and other blood cells shrink or swell.

So, for flushing blood in and out of dialysis machine (pipes) and all other purpose, salt solution is used so as to maintain same concentration, as that of blood.

Hope this helps you...

:-)