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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).
1. actin-one of the proteins into which actomyosin can be split; can exist in either a globular or a fibrous form. actomyosin-a protein complex in muscle fibers; composed of myosin and actin; shortens when stimulated and causes muscle contractions.