This card details double closed circulatory systems found in most mammals and birds, emphasizing their efficiency and that blood passes through the heart twice per circulation.
Tato karta podrobně popisuje dvojité uzavřené oběhové systémy, které se nacházejí u většiny savců a ptáků, zdůrazňuje jejich efektivitu a to, že krev oběhne srdce dvakrát během jednoho oběhu.
| Front | Double closed circulatory systems 3.1.2(b) |
|---|---|
| Back | - most mammals/birds active and maintain body temp (so need most efficient system) - blood pumped from heart to lungs (O2 collection/CO2 removal) then back to heart - blood flows through heart and pumped to travel around body before returning to heart - therefore blood travels twice per circulation, each circuit only passes through 1 capillary network (high pressure so blood travels fast) |
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