Biology — Blood Vessels

Structure and role of arteries, veins and capillaries.

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digraph Vessels {
  node [shape=box, style=rounded];
  "Blood vessels" -> "Arteries (thick, elastic, high P)";
  "Blood vessels" -> "Veins (valves, low P)";
  "Blood vessels" -> "Capillaries (one cell thick)";
  "Capillaries (one cell thick)" -> "Exchange of materials";
}