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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