Final answer:
Iron enters the blood from intestinal epithelial cells and macrophages through the channel protein ferroportin, and travels through the bloodstream bound to the plasma protein transferrin. Ferroportin is involved in the export of iron from cells into the bloodstream.
Step-by-step explanation:
The channel protein responsible for transporting iron into the blood from intestinal epithelial cells and macrophages is ferroportin. Once in the blood, iron is bound to a plasma protein called transferrin. Iron enters the blood from intestinal epithelial cells and macrophages through a channel protein called ferroportin, and it travels through the bloodstream bound to a plasma protein called transferrin. Ferroportin is involved in the export of iron from cells into the bloodstream, while transferrin is a carrier protein that binds to iron and transports it in the blood, helping to regulate its distribution and delivery to various tissues in the body.
Iron enters the blood from intestinal epithelial cells and macrophages through a channel protein called ferroportin, and it travels through the bloodstream bound to a plasma protein called transferrin. Ferroportin is involved in the export of iron from cells into the bloodstream, while transferrin is a carrier protein that binds to iron and transports it in the blood, helping to regulate its distribution and delivery to various tissues in the body. Once in the blood, iron is bound to a plasma protein called transferrin. Iron enters the blood from intestinal epithelial cells and macrophages through a channel protein called ferroportin, and it travels through the bloodstream bound to a plasma protein called transferrin.