Which heart chamber receives deoxygenated blood from the systemic circulation?

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The chamber that first receives deoxygenated blood from the systemic circulation is the right atrium. Blood returning from the body via the superior and inferior vena cavae enters the right atrium, then moves through the tricuspid valve to the right ventricle, which pumps it to the lungs for oxygenation. Oxygenated blood then comes back to the left atrium and is pumped by the left ventricle to the body. So, the right atrium is the entry point for systemic (deoxygenated) blood.