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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 contraction of a muscle, calcium ions bind to... the actin myofilament. the troponin molecule. the tropomyosin molecule. the sarcoplasmic reticulum. the sarcolemma. 2. The bond between the actin and myosin head is broken when... an ATP molecule binds to the myosin head.an ATP molecule binds to the actin molecule. an ATP molecule breaks down on the myosin head.he bond between the actin and myosin head is broken when... an ATP molecule binds to the myosin head. an ATP molecule binds to the actin molecule. an ATP molecule breaks down on the myosin head.