Question

pls can some one answer to my question . pls

What happens when the left and right auricle contracts and relaxes ?

Answer 1

When the right auricle relaxes and expands, deoxygenated blood enters it. when it contracts the blood moves to the right ventricle.
When the left auricle relaxes oxygenated blood enters it from the heart through the pulmonery vein. When it contracts this blood moves to the left ventricle