Architecture of the Circulation, Dr. D. Penney

Varieties of circuitry:

  • Simple routes - single capillary bed in series with artery and vein. Most routes in body of this type. e.g. head, limbs, coronary circulation, one hepatic circulation.

  • Two capillary beds in series. e.g. kidney.

  • More complicated series and parallel arrangements, e.g. portal system where spleen and mesentery are in parallel and both in series with sinusoids of the liver.

  • Right to left route (all 3 above are L to R).

  • Shunts. e.g. bronchial circulation, thebesian circulation across left heart only.

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