Final answer:
The liver is the organ that regulates the body's iron stores through the storage of ferritin and hemosiderin. These storage forms of iron act as reserves to protect against sudden iron loss.
Step-by-step explanation:
The organ that regulates the body's iron stores is the liver. Iron can be stored in the liver, spleen, and bone marrow in the form of ferritin and hemosiderin. These storage forms of iron act as internal reserves to protect against sudden iron loss. When the body needs iron, it can release it from storage and transport it through the bloodstream.