sinoatrial

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Relating to the venous sinus and the right atrium of the heart
{s} pertaining to the sinus venosus and the right atrium of the heart (Anatomy)
sinoatrial node
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
sinoatrial
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