noun
sinus node; sinoatrial node
Medical term for the heart's natural pacemaker. Often used in cardiology contexts.
See also: 洞房結節
洞結節は心臓の右心房にあります。
The sinus node is located in the right atrium of the heart.
洞結節
When the function of the sinoatrial node declines, arrhythmia may occur.