What reactions of the body during massive bleeding are protective?

In case of massive bleeding, our body uses all reserves of “spare” blood, which is located in the spleen, liver, in order to maintain blood supply to vital organs (brain, heart, etc.) as long as possible, thereby giving time to the homeostasis system to form blood clots to stop blood loss. Also, the body has learned at such dangerous moments to redistribute blood from the least important organs (limbs) to preserve life to more important ones. Your heart rate may also slow down.