Explain the terms ultrafiltration and selective absorption

Dear student,
Ultrafiltration is a technique to separate dissolved molecules in a solution on the basis of size through pores on membrane. Larger size molecules retains on membrane, whereas smaller size molecules pass through it. This technique is used in industry and other areas to separate macromolecules such as proteins. It also occur during filtration of blood in glomerulus of kidney.
Selective reabsorbtion is a process of reabsorbtion of only selected substances from filtrate after filtration.

It occurs in the proximal tubule of kidney, some substances within glomerular filtrate such as amino acids, glucose, and salts are selectively reabsorbed and unwanted molecules are added in the urine. The filtrate then moves down into the loop of Henle, in which more water is reabsorbed.



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