Final answer:
Heparin is preferred in some nonmammalian species because it acts as an anticoagulant, opposing coagulation. It helps prevent blood clots and promotes smoother blood flow. Heparin is a short-acting anticoagulant and is often used therapeutically.
Step-by-step explanation:
Heparin is preferred in some nonmammalian species because it acts as an anticoagulant, opposing coagulation. In these species, heparin is stored in mast cells and released when tissues are injured. It helps prevent blood clots and promotes smoother blood flow. Heparin is also found on the surfaces of cells lining the blood vessels. It is a short-acting anticoagulant and is often used therapeutically, especially in surgical patients at risk for blood clots.