单词	sino-atrial
释义	sino-atrial /ˌsʌɪnəʊˈeɪtrɪəl / adjective Anatomy Relating to or denoting a small body of specialized muscle tissue (the sino-atrial node) in the wall of the right atrium of the heart, whose contractions regulate the heartbeat.This activity arises not from excitatory nerve fibres, but spontaneously within the heart itself from a small clump of pacemaker cells near the point where the vena cava joins the right atrium: the sino-atrial node.... The classical concept of the source of cardiac rhythm is that it originates from the sino-atrial node. Procoralan exclusively reduces heart rate by a specific action on the sino-atrial node. Origin Early 20th century: from sinus + atrial (see atrium).
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