| 单词 | sino-atrial node |
| 释义 | > as lemmassino-atrial node Of, pertaining to, or designating a small body of tissue (the sino-atrial node) in the wall of the right atrium of the heart that acts as a pacemaker by producing a contractile signal at regular intervals; (so called because it arises in the embryo at the junction of the sinus venosus and the atrium). Cf. sinuatrial adj. ΘΚΠ the world > life > the body > vascular system > heart > [adjective] > atrium atrial1859 atrioventricular1879 S.A.1908 interatrial1911 sino-atrial1913 sinuatrial1935 ventriculoatrial1959 1913 Gray's Anat. (ed. 18) 552 The sino-atrial node is situated on the anterior border of the opening of the superior vena cava. 1962 Listener 10 May 810/1 A small mass of specialized muscle cells within the heart, the sino-atrial node, discharges a brief electric ‘spark’ regularly seventy-two times a minute or thereabouts. 1969 W. Cleland et al. Med. & Surg. Cardiol. ii. 43 Absence of the P wave may be due to sinoatrial block or atrial dysrhythmia. < as lemmas |
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