• Hemostasis has to go like a demon when it's called on, but still remain localized and under control.
• Our blood volume represents only about 5% of our body weight, but losing half of it acutely can be fatal.
• Even if you don't die from the blood loss, you can be rendered weak and unstable. Not a desirable feature if you're fighting for survival.
• Remember, our blood is not just flowing willy-nilly, it's being pumped under pressure.

Photo Courtesy of: Das Musical-Theatre Bremen

• The events of clot formation have to remain localized.
• Imagine the consequences if clotting a small cut led to a run-away-train wreck of overwhelming disseminated coagulation.
• Our genes would be out of the gene pool in a flash.