GENERAL HISTOLOGY

EXCRETORY SYSTEM

KIDNEY

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
In dialysis it is important to maintain a concentration gradient between the blood and the dialysing fluid. Why?
A
so diffusion continues to occur
B
so osmosis continues to occur
C
so wastes stay in the blood
D
None of the above
Explanation: 

Detailed explanation-1: -As the dialysis fluid contains a glucose concentration equal to a normal blood sugar level, this prevents the net movement of glucose across the membrane as no concentration gradient exists. This is very important as the patients’ need to retain glucose for respiration.

Detailed explanation-2: -The formal definition of diffusion in dialysis is movement of solutes as a result of random molecular motions across a semipermeable membrane down its concentration gradient. With dialysis most of the toxin removal is accomplished by diffusion.

Detailed explanation-3: -During diffusion, particles in the areas of high concentration move towards the area of low concentration. Picture how a tea bag works-the leaves stay in the bag and the tea enters the hot water. In dialysis, waste in your blood moves towards dialysate, which is a drug solution that has none (or very little) waste.

Detailed explanation-4: -Dialysis is a separation process in which concentration gradient works as a driving force to separate solute and solvent. Due to the concentration difference, diffusion arises and solute passes across the membrane. Unlike pressure-driven process, this process is slow.

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