| 单词 | sinoatrial node |
| 释义 | sinoatrial node /suy"noh ay"tree euhl, suy'-/, Anat. a small mass of tissue in the right atrium functioning as pacemaker of the heart by giving rise to the electric impulses that initiate heart contractions. Also called sinus node. [1920-25; SINO- + ATRIAL] |
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