Describe the role the nephrons play in the kidneys. Which substances are filtered out; which are reabsorbed? By what mechanism are sugars, amino acids, and salts reabsorbed?
The nephrons filter out urea and any other substances above their kidney threshold level from the blood. The nephrons re absorb water as well as sugars, amino acids, and salts from the filtrate in their lumen, returning these materials to the blood. Sugars, amino acids, and salts are returned from the nephrons to the blood via an active transport mechanism in the form of a sodium/potassium pump.
