(2) When blood flows through the glomerulus, other substances such as water, inorganic salts, urea, glucose, etc. will be filtered into the renal capsule cavity except protein and macromolecules of blood cells to form protourine; Therefore, compared with plasma, raw urine does not contain macromolecular protein.
(3) When raw urine flows through renal tubules, most water, some inorganic salts and all glucose are reabsorbed into blood, and the rest, such as urea, some inorganic salts and water, flow out of renal tubules to form urine. Therefore, urine does not contain glucose and is reabsorbed by renal tubules.
So the answer is: (1) water; Urea;
(2) filtering;
(3) reabsorption.