This card describes single closed circulatory systems, where blood passes through the heart once per circulation, mentioning limitations like low blood pressure and slow return, with fish as an exception.
Tato karta popisuje jediné uzavřené oběhové systémy, kde krev protéká srdcem pouze jednou za oběh, a zmiňuje jejich omezení, jako je nízký krevní tlak a pomalý návrat krevního oběhu, s poznámkou o rybách jako výjimce.
| Front | Single closed circulatory system 3.1.2(b) |
|---|---|
| Back | - in fish and annelid worms - blood travels through heart once per circulation - blood passes through 2 sets of capillaries before returning to heart - in first, O2/CO2 exchanged, in second (in the diff organ systems), substances exchanged between blood and cells (both caps narrow, so low blood pressure so returns to heart slowly) - fish are exception as countercurrent system, body weight supported by water and don’t maintain body temp (low metabolic demands) so fish can still be active |
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