sinoatrial node

sinoatrial-node的词性：
n.（名词）

1. A small mass of specialized cardiac muscle fibers located in the posterior wall of the right atrium of the heart that acts as a pacemaker by generating at regular intervals the electric impulses of the heartbeat.Also called sinoauricular node, sinus node
窦房结：位于右心房后壁的一小块特殊的心肌纤维，作为起搏器以正常的间隙引起心脏的电脉冲也作 sinoauricular node， sinus node