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Graph that demonstrates the Michaelis–Menten kinetics model for the relationship atween an enzyme an a substrate: ane o the parameters studies in pharmacokinetics, whaur the substrate is a pharmaceutical drog.

Pharmacokinetics (frae Ancient Greek pharmakon "drog" an kinetikos "muivin, puttin in motion"; see chemical kinetics), whiles abbreviatit as PK, is a brainch o pharmacology dedicatit tae determinin the fate o substances admeenistered tae a leevin organism. The substances o interest include ony chemical xenobiotic sic as: pharmaceutical drogs, pesticides, fuid additives, cosmetic ingredients, etc.