What to know Basic definitions of filtration, secretion and reabsorption Know th

Question

What to know Basic definitions of filtration, secretion and reabsorption Know the factors that can affect GFR Know routes of tubular reabsorption Know the meaning and implications of a substance having a transport maximum. Relative numbers of substances that are reabsorbed (don't memorize the chart, but have a basic idea) Examples of substances that are secreted Substances that urine should not contain Locations and amounts in the tubule where water and sodium are reabsorbed Mechanism of Na-reabsorption in the proximal tubule

Explanation / Answer

1.Filetration:Filtration of protien free fluid from the blood in glomerular capillaries into the lumen of Bowmans capsule is called as ultrafiltration.

Reabsorption: Absorption of useful substances from the ultrafiltrate as it passes through the cavity of Nephron into the blood of peritubular capillaries is called as reabsorption or tubular reabsorption.

Secretion: removal of waste substances from the blood of peritubular capillaries into the ultrafiltrate is called as tubular secretion.

2. Factors that affect GFR are;

Arterial pressure.

Glomerular capillary pressure.

Colloidal osmotic pressure.

Hydrostatic pressure of Bowmans capsule.

3. Tubular reabsorption takes place from the renal tubule 8nt of blood flowing in peritubular capillaries.

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