I started to let the above posts stand alone as answers, as they are absolutely correct. As it sounds like you're obviously new to bowhunting, I thought I'd take just a sec to explain why...

Gun-killed deer are often killed by massive trauma andshock alone. Deer killed with archery equipment, for the most part, are killed by loss of blood. Given that, think about this: Ever cut yourself with a jagged piece of metal, maybe accidentally playing around a pile of tin or something? Bleeds for a little bit, but clots pretty quickly. Now... think about the times you've cut yourself shaving. Bleeds incessantly. Sometimes, it can be a real chore to stop the blood flow, right? Same principle.