oxygen to the tissues that burn first when supply drops — the muscles in your legs, the tips of your toes, the places that feel weak, cold, or strangely empty.
Anatomy
Without enough iron, the body can have blood but still fail to deliver enough oxygen where it counts. That is why some people feel like they are walking through wet cement even when they are technically “fine.”
Think of a warehouse with half the trucks missing. The packages are ready, the orders are waiting, but nothing reaches the loading
