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Stage 1
Ultrafiltration occurs due to high hydrostatic pressure. Water and small molecules are forced out of the glomerulus capillaries into the renal capsule.
Stage 2
Selective reabsorption occurs in the proximal convoluted tubule.
Stage 3/4
The loop of Henle maintains a sodium ion gradient so water can be reabsorbed by the blood.
Stage 5/6
Water moves out of the distal convoluted tubule and collecting duct to return back to the blood. The collecting duct then carries the remaining liquid (urine) to the ureter.
