A single-chain, iron-containing protein of 153 amino acids found in cardiac and striated muscle fibers, structurally similar to a single sub-unit of hemoglobin and having a higher affinity for oxygen than hemoglobin of the blood. It makes oxygen available to the muscles for contraction, and it gives up oxygen only under anoxic conditions. When muscle is damaged, myoglobin is released into the blood.
See Amino acids, Anoxia, Hemoglobin, Proteins Smooth (or involuntary) muscles, Striated (or striped or voluntary) muscles, Type 1 muscle fibers, Type 2 muscle fibers