Biology — Double Circulation
Pulmonary and systemic circuits through the heart.
Rendering…
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digraph Circulation {
rankdir=LR;
node [shape=box, style=rounded];
Body -> "Right atrium" [label="deoxygenated"];
"Right atrium" -> "Right ventricle" -> Lungs [label="pulmonary artery"];
Lungs -> "Left atrium" [label="oxygenated"];
"Left atrium" -> "Left ventricle" -> Body [label="aorta"];
}