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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 an iron-and oxygen-binding protein found in the muscle tissue of vertebrates in general and in almost all mammals. It is related to hemoglobin, which is the iron â¦ - and oxygen-binding protein in blood, specifically in the red blood cells.The only time myoglobin is found in the bloodstream is when it is released following muscle injury. It is an abnormal finding, and can be diagnostically relevant when found in blood.t is related to hemoglobin, which is the iron â¦ - and oxygen-binding protein in blood, specifically in the red blood cells. The only time myoglobin is found in the bloodstream is when it is released following muscle injury. It is an abnormal finding, and can be diagnostically relevant when found in blood.