Myoglobin is a protein found in muscle tissues that plays a crucial role in storing and transporting oxygen. It is similar to hemoglobin, the protein in red blood cells, but myoglobin is specifically adapted for muscle cells. This protein binds oxygen molecules, allowing muscles to have a readily available supply of oxygen during physical activity. Myoglobin is particularly important for endurance activities, as it helps muscles maintain energy levels during prolonged exertion. The amount of myoglobin in muscle tissue can vary depending on the type of muscle and the animal species, with higher levels typically found in animals that require sustained muscle activity, such as whales and racehorses.