I told my boyfriend we were learning about epithelial tissues and such so he went out and got this fantastic bruise for me! Took a hockey puck to the arm actually, hazard of using your body to stop them from flying into a net, I suppose!
Anyway, bruises are a result of injury to the endothelium lining of capillaries which causes blood to leak out into the surrounding tissues. The colors of a bruise are a result of hemoglobin breakdown and phagocystosis within the tissues.
Ryan's bruise is really tender. It is also very hot to the touch, but I assume there is quite an inflammatory response happening.
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