心肌的等长调节是通过改变下列哪个 因素来调节心脏的泵血功能（）^

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SQL Error: select id,body,options from ***_enewstiku where sourceid='28671' and id < 2339903 and id<>'2339903' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='28671' and id > 2339903 and id<>'2339903' order by id asc limit 5