The last proposed system of RBC vasodilation in the presence of nitrite is the reduction of nitrite to NO by Hb. Brooks first researched the nitrite Hb interaction in 1937 and this operate was later extended by Doyle in 1981 (Brooks, 1937; Doyle et al., 1981). Nitrite reacts with deoxygenated Hb to sort metHb and NO (Brooks, 1937; Doyle et al., 198