Myoglobin is a protein found in muscle tissue. It has the capacity to bind to iron and therefore oxygen as well.
Its molecular cousin is hemoglobin, the oxygen and iron binding protein found in found red blood cells, which delivers oxygen throughout the body via the bind and release capacity of iron.
Myoglobin is the same type of oxygen-carrying pigment. Myoglobin is only found in muscle.
Research suggests that high amounts of myoglobin in muscle improve aerobic capacity.
Myoglobin is found in the bloodstream only after muscle injury.
Myogobin in the blood indicates pathology.