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The nephron is the most basic and functional unit of the kidneys. 

1. Glomerulus - Filters the blood.
2. Tubule/Renal Tubule/Kidney Tubule - Provides a passage for wastes, excess water, and other substances to move out from Glomerulus.

1. Filters blood by removing excess water, wastes, and other materials.
2. Ingest substances like sodium, potassium or phosphorus into blood whenever they are in low supply.