Biology — Double Circulation

Pulmonary and systemic circuits of the blood.

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digraph Circulation {
  rankdir=LR;
  node [shape=box, style=rounded];
  "Right heart" -> "Lungs" [label="pulmonary artery"];
  "Lungs" -> "Left heart" [label="pulmonary vein (oxygenated)"];
  "Left heart" -> "Body" [label="aorta"];
  "Body" -> "Right heart" [label="vena cava (deoxygenated)"];
}