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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).
During the period of contraction, _____ form and the muscle fiber shortens. Once myosin binds to actin, _____ changes shape, pulling the two filaments past one another. myosin As the two filaments (actin and myosin) slide past one another, _____ are released from the myosin. In order for myosin to release actin, it must bind _____.