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The three phases involved in the formation of urine in the kidney tubules are :

1.Simple filtration- large molecules like blood cells and plasma proteins are unable to filter through the first part of the tubules and so stay in the blood.

2.Selective reabsorption- this is where those substances needed by the body, like sodium potassium ,are reabsorbed in the kidney to maintain the correct amount of fluid and substances.

3.Secretion- substances that are not required by the body and foreign materials, like drugs, are then secreted from the blood into the urine.

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