Which describes the heart’s pacemaker?
It sends signals that make the heart expand.
It is located in the right ventricle of the heart.
It adjusts heart rate based on oxygen needs.
It removes wastes from the bloodstream.
It sends signals that make the heart expand.
It is located in the right ventricle of the heart.
It adjusts heart rate based on oxygen needs.
It removes wastes from the bloodstream.