what does myoglobin do during muscle contraction
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).