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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).
smooth muscle contraction. -calmodulin is the protein used to bind calcium ions to skeletal muscle when its fibers are stimulated. -hormones can stimulate or inhibit contraction. -stretching of the muscle can cause contraction. -slower to contract and relax, but can forcefully contract longer with the same amount of ATP.