心肌的等长自身调节，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='25935' and id < 2179405 and id<>'2179405' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='25935' and id > 2179405 and id<>'2179405' order by id asc limit 5