Question

explain ultrafiltration and selective reabsorption?​

Answer 1

Answer:

Explanation:

Ultrafiltration is a passive physical-chemical process whose only selectivity is due to molecule size. ... This is an active (energy-consuming) process involving molecular pumps for particular small ions and/or glucose into and out of cells in certain stretches lining the lumen of the tubule leading from the nephron.

SELECTIVE REABSORBTION

Selective reabsorption occurs because during ultrafiltration, important components of the blood are filtered out and they need to be reabsorbed into the body. ... This occurs by them diffusing from the filtrate into the cells lining the proximal convoluted tubule.

Answer 2

Explanation:

Ultrafiltration (UF) is a variety of membrane filtration in which forces like pressure or concentration gradients lead to a separation through a semipermeable membrane. Suspended solids and solutes of high molecular weight are retained in the so-called retentate, while water and low molecular weight solutes pass through the membrane in the permeate (filtrate). This separation process is used in industry and research for purifying and concentrating macromolecular (103 - 106 Da) solutions, especially protein solutions.

Selective reabsorption is the process whereby certain molecules (e.g. ions, glucose and amino acids), after being filtered out of the capillaries along with nitrogenous waste products (i.e. urea) and water in the glomerulus, are reabsorbed from the filtrate as they pass through the nephron. Selective reabsorbtion occurs in the PCT (proximal convoluted tubule). The PCT is highly permeable meaning it is easy for molecules to diffuse through it.

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