In birds and mammals,a vestige of the sinus venosus of the fish heart remains as the sinoatrial node,which serves as a(n)

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The sinoatrial node serves as the pacemaker for the heart, initiating the electrical signals that cause the heart to contract and pump blood. While the sinus venosus does play a role in the fish heart, its vestige in birds and mammals is primarily associated with the pacemaker function of the heart.

In Birds and Mammals,a Vestige of the Sinus Venosus of the Fish