Approximately 700 g of phosphorus exist in adult tissues, in which about 85% is present in the bones and teeth, while the rest is distributed throughout the body in cells, blood, and other fluid.
Absorption probably occurs throughout the small intestine; transport is greatest in the jejunum, less in the duodenum, and minimal in the ileum.
Phosphorus is quickly absorb from the intestine and into the blood, appearing in the blood within about an hour after ingestion.
Transport across the enterocyte’s basolateral; membrane for entrance into the blood is thought to occurs by facilitated diffusion.
The active transport of phosphate occurs by way of two independent carrier mediated processes, a high affinity and a low affinity system.
About 70% of phosphorus is present as organic phosphate, such as that found as phospholipids in lipoprotein. Lipid containing phosphorus as part of their structures (phospholipids) help to transport other lipids in the blood.
Phospholipids are also major structural components of cell membranes, where they control the transport of nutrients into and out of the cells.
Phosphorus transportation
