What fluid enter the filter element surrounded by the nephron (kidney)?

is it blood that passes from the capillary to the filtering unit?? OR does some other fluids/substances move out the blood in the capillary and go into the filtering element of the nephron??
Answers:
Each nephron is composed of an initial filtering component (the "renal corpuscle") and a tubule specialized for reabsorption and secretion (the "renal tubule"). The renal corpuscle filters out large solutes from the blood, deliver water and small solutes to the renal tubule for modification.

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Yea, its blood.

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