Formation of Urine

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through the walls of the glomerular capillaries and Bowman's capsule. The filtrate is composed of water, ions such as sodium, potassium, chloride, glucose and small proteins.

Also, the amount of any substance that gets filtered is the product of the concentration of that substance in the blood and the rate of filtration. So the higher the concentration, the greater the amount filtered or the greater the filtration rate, the more substance gets filtered.

The arrangement of the glomerular capillaries in series with the tubular capillaries is important to maintain a steady pressure in the glomerular capillaries, and thus a constant rate of filtration. Once the filtrate has entered the Bowman's capsule, it flows through the lumen of the nephron into the proximal tubule.

Once inside the lumen of the nephron, small molecules, such as ions, glucose and amino acids, get reabsorbed from the filtrate specialized proteins called transporters are located on the membranes of the ...

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