The left atrium, I believe. It's whichever one is on top, and I think that's the atrium.
i have no clue
The right atrium receives blood from the superior and inferior vena cavae, which collects blood from the body.
The left atrium collects oxygenated blood from the lungs. This blood is transported via the pulmonary veins, which bring it from the lungs to the heart. Once filled, the left atrium contracts and sends the oxygen-rich blood into the left ventricle, which then pumps it out to the rest of the body.
Blood collects into small veins that in turn merge to form trabecular veins
Blood vessels that return blood to the heart from the rest of the body are called veins. The two main veins responsible for this are the superior vena cava, which collects blood from the upper body, and the inferior vena cava, which collects blood from the lower body. These veins transport deoxygenated blood back to the right atrium of the heart.
The left atrium receives oxygenated blood from the pulmonary veins
Blood that has perfused the lungs and is now oxygenated collects into the pulmonary veins to travel back to the heart. Once reaching the heart, oxygenated blood from the lungs enters the left atrium. The left atrium collects blood from the lungs
Left ventricle
The pulmonary veins carry oxygenated, pure blood from the lungs to the left atrium of the heart.
The pulmonary veins take oxygenated blood from the lungs to the left atrium.
It collects the blood returning from the body in the veins and sends it to the lungs.
They are many, like the superior vena cava