Many of today's crew-cab pickups have the same legroom as a luxury sedan, and even shoppers who don't go for a crew cab will find that many extended-cab trucks have more passenger room than you'd need under usual circumstances.
n. The protein in the red blood cells of vertebrates that carries oxygen from the lungs to tissues and that consists of four polypeptide subunits, each of which is bound to an iron-containing heme molecule.[Ultimately short for. : hematin + globulin .].. The protein in the red blood cells of vertebrates that carries oxygen from the lungs to tissues and that consists of four polypeptide subunits, each of which is bound to an iron-containing heme molecule. [Ultimately short for.
1 Iron promotes normal red blood cell production. 2  Iron is a vital component of hemoglobin. 3  Hemoglobin is the protein that transports oxygen in the blood. 4  Iron plays a role in delivering oxygen to the cells, including muscle cells. 5  Iron plays a key role in energy metabolism.he body's normal supply of iron is maintained by the body itself; it adjusts and controls the amount it absorbs from the food we eat. 1  Every living cell contains iron. 2  Iron promotes normal red blood cell production. 3  Iron is a vital component of hemoglobin. 4  Hemoglobin is the protein that transports oxygen in the blood.