This indicated that effects of exogenous calcium were mainly extracellular effects. The EGTA,Ca2+ specific chelator,and Ca2+ antagonist La3+ ,Co2+and CPZ,TFP CaM antagonists,decreased the respiration rate.

• Ca~(2+)专一性螯合剂EGTA和Ca~(2+)拮抗剂La(3+)、Co(2+)以及钙调素拮抗剂CPZ和TFP降低呼吸速率。