First of all, cholinergic fibers exist in artrium and ventricle myocardium of these animals.
First of all, cholinergic fibers exist in artrium and ventricle myocardium of these animals.
果表明：四种动物心脏的心房和心室收缩心肌内均含有胆碱能纤维； 心脏不同部位的心肌内胆碱能纤维的分布密度不同；
First of all, cholinergic fibers exist in artrium and ventricle myocardium of these animals.
果表明：四种动物心脏的心房和心室收缩心肌内均含有胆碱能纤维； 心脏不同部位的心肌内胆碱能纤维的分布密度不同；