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Cross bridge ATP utilization in arterial smooth muscle

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Summary

Measurements of oxygen consumption and lactate production were used to estimate the ATP production in porcine carotid arteries. Changes in the total energy metabolism were correlated with changes in force which was altered by changing the muscle length under maximum stimulation. This tension-dependent metabolism could be used to distinguish between cross bridge and other ATP utilization. The tension-dependent metabolism was equal under K+-depolarization or histamine stimulation. Tension cost was 300x smaller than skeletal muscle while the cross bridge cycle duration 30x longer.

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Paul, R.J., Glück, E. & Rüegg, J.C. Cross bridge ATP utilization in arterial smooth muscle. Pflugers Arch. 361, 297–299 (1976). https://doi.org/10.1007/BF00587295

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Key words

  • Arterial muscle metabolism
  • Actomyosin ATPase
  • Mechanochemistry
  • Oxygen Consumption