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At onset of muscle contraction, myoglobin (Mb) immediately releases its bound O 2 to the mitochondria. Accordingly, intracellular O 2 tension (P mb O 2) markedly declines in order to increase muscle O 2 uptake (m O 2).t onset of muscle contraction, myoglobin (Mb) immediately releases its bound O 2 to the mitochondria. Accordingly, intracellular O 2 tension (P mb O 2) markedly declines in order to increase muscle O 2 uptake (m O 2).
This test measures the amount of a protein called myoglobin in your blood. It's done to help diagnose conditions caused by muscle damage. Myoglobin is found in your heart and skeletal muscles. There it captures oxygen that muscle cells use for energy.When you have a heart attack or severe muscle damage, myoglobin is released into your blood. Myoglobin increases in your blood 2 to 3 hours after the first symptoms of muscle damage.here it captures oxygen that muscle cells use for energy. When you have a heart attack or severe muscle damage, myoglobin is released into your blood. Myoglobin increases in your blood 2 to 3 hours after the first symptoms of muscle damage.