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.
Report Abuse. Good Idea. I think used dirt bikes are a great way to go because there is such a huge variety of them at a very good value. There are lots of near new bikes in that 90cc, 4-stroke range and they're priced anywhere from $100 - $450.There are quite a few good places to look for used dirt bikes.Newspaper ads and local shops are okay, but the best place to shop is online eBay auctions, in my opinion.here are lots of near new bikes in that 90cc, 4-stroke range and they're priced anywhere from $100 - $450. There are quite a few good places to look for used dirt bikes.