Regulation of iron absorption and transport. Iron for use in synthesis of heme, iron-sulfur centers and other non-heme iron proteins is obtained from the diet and via release of recycled iron from macrophages of the reticuloendothelial system that ingest old and damaged erythrocytes (red blood cells).
Four-stroke oil is more like the oil used in cars but both 2-stroke and 4-stroke oil serve the same purpose - to keep the engine lubricated. Four-stroke dirt bike oil comes in a variety of weights like 10w-40, 20w-50 and so on. It is not mixed with gas.
Weight, more than any other factor, influences how well a dual sport adventure motorcycle handles off-pavement riding. The heavier the bike, the more difficult it is to ride in the dirt â thatâs why motorcycle manufacturers do everything they can to make their race bikes as light as legally allowed. The impact that weight has on a bikeâs dirt handling abilities canât be over-emphasized. For many years motorcycle manufacturers would not report the real weight of their bikes, gassed up and in a ready to ride state. Instead they published a âdry weightâ that more often than not had no basis in reality.