<unk>  is the process whereby certain molecules (e.g. ions, glucose and amino acids), after being filtered out of the capillaries along with nitrogenous waste products (i.e. urea) and water in the glomerulus, are reabsorbed from the filtrate as they pass through the nephron.<unk>  occurs in the PCT (proximal convoluted tubule). The PCT is highly permeable meaning it is easy for molecules to diffuse through it.
Selective reabsorption
Bioconcentration
Countercurrent exchange
Tubuloglomerular feedback
Reabsorption
Renal compensation
Infiltration 
Natriuresis