The left atrium, I believe. It's whichever one is on top, and I think that's the atrium.
atriums
i have no clue
The right atrium receives blood from the superior and inferior vena cavae, which collects blood from the body.
Blood collects into small veins that in turn merge to form trabecular veins
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 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
Heart blood vessels is what collects blood and pumps it to the lower chamber. This is what keeps the heart in working function.
The left atrium.
The left atrium