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four components of blood
plasma, red blood cells, white blood cells, and platelets
blood cells that carry oxygen
red blood cells
what do platelets do
cause blood clotting (stop bleeding when when blood vessel is damaged)
antigen
substance that triggers an immune response ; markers that determine blood type
antibody
on the surface of blood cells that fight antigens that we DON’T have
antigen location in blood typing
on the surface of red blood cells
universal donor
O- (have neither A or B antigen and lacks RH factor)
universal recipient
AB+
negative and positive relationship
negative can give to positive but positive can’t give to negative (ex A- can give to A+)
bloodstain tail
points at direction of motion