Open circulatory systems have minimal vessels; the heart pumps hemolymph at low pressure into the body cavity (hemocoel), allowing direct contact with tissues for exchange, although hemolymph in insects doesn't usually transport gases.
Open circulatory systems have few vessels; the hemolymph, at low pressure, is pumped from the heart into the body cavity (hemocoel) where it directly contacts tissues for exchange, but it does not typically carry gases in insects.
| Front | Describe the features of open circulatory systems. |
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| Back | Open circulatory systems:
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