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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).
Myoglobin is a protein found in muscles that binds oxygen with its heme group like hemoglobin. Heme group consists of protoporphyrin organic component and an iron atom located in its center. The heme group gives muscle and blood their distinctive red color.