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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).
What is the role of tropomyosin in skeletal muscles? A. Tropomyosin is the chemical that activates the myosin heads. B. Tropomyosin serves as a contraction inhibitor by blocking the myosin binding sites on the actin molecules.