This card describes open circulatory systems, their low-pressure pumping of haemolymph into body cavities, and the limitations, such as inability to maintain gradients and variable nutrient supply.
Tato karta popisuje otevřené oběhové systémy, jejich nízkotlaké čerpání hemolymfy do tělních dutin a omezení této metody, jako je neschopnost udržovat gradienty a variabilní přísun živin.
| Front | Open circulatory system 3.1.2(b) |
|---|---|
| Back | - few vessels, so medium pumped from heart into body cavity (open BC called called hemocoel) where medium under low pressure - direct contact with tissues/cells (exchange), then returns to heart - mainly in invertebrates, their blood called haemolymph (don’t carry O2/CO2, carries food, nitrogenous waste products and cells against disease), a steep concentration gradient can’t be maintained and amount can’t vary to meet varied demands of tissues |
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