If you mean atrium, it is the right ventricle.
Right ventricle collects the blood from right auricle.
right auricle
The right side of our heart (right auricle)receives blood from the all body veins . i just learnt that in my work!
Right ventricle
the lower chamber or ventricles of heart receives the blood from respective auricles. From right auricle deoxygented blood flows in right ventricle which is then pass to lungs for purification, and from left auricle oxygenated blood is poured in left ventricle which then provided to different tissue system
From the right auricle [aka right atrium].
The right auricle, or right atrium, receives deoxygenated blood from the body via the superior and inferior venae cavae, while the left auricle, or left atrium, receives oxygenated blood from the lungs through the pulmonary veins. Structurally, the right auricle has thinner walls compared to the muscular left auricle, which is designed to handle higher pressure from the systemic circulation. Additionally, the right auricle contains the sinoatrial node, the heart's natural pacemaker, while the left auricle plays a role in the heart's blood flow dynamics but does not contain this node.
Pulmonary veins receives blood from the lungs and brings it back to the heart to be circulated to the rest of your body. It is the only vein that carries blood to the heart (that's usually an artery's job).
It is left auricle in heart which receives blood from the lung.
Right ventricle
The right auricle collects the deoxygenated blood from the vena cava; the left auricle collects the oxygenated blood from the lungs. The right auricle pushes the blood towards the right ventricle; the left auircle pushes the blood towards the left ventricle.
Right auricle which receives deoxygenated blood from all parts of the body from veins.