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Fluid
- hemolymph: open
- blood: closed
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Tissue
both have connective
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Interstitial fluid
- Indistinct from interstitial fluid: open
- is distinct since blood never exits: closed
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Transport
- both carry and transport respiratory gases, but
- open: not in cells
- closed: transports in RBCs
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Primary Respiratory Pigment
- open: hemocyanin-O2 transport
- closed: hemoglobin, the only one in vertebrates
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Explain hemocyanin
- - unlike hemoglobin, hemocyanin is not in cells= its free in the fluid of the hemolymph
- uses copper instead of iron; similar structure
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