Final answer:
Heparin is the body's natural anticoagulant found in basophils and blood vessel lining cells, helping prevent blood coagulation. Other natural anticoagulants include the protein C system, TFPI, antithrombin, and vitamin K₁.
Explanation:
The body's natural anticoagulant is heparin, a short-acting anticoagulant found in basophils and on the surfaces of blood vessel lining cells. It is also administered therapeutically in surgical patients to prevent blood clots. Other natural anticoagulants include the protein C system, TFPI, antithrombin, and vitamin K₁.
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