| 1. | The majority of gastropods have haemolymph containing the respiratory pigment haemocyanin.
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| 2. | There are no phagocytic amoebocytes and cells containing the respiratory pigment haemerythrin.
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| 3. | There is no true heart and the blood often lacks any respiratory pigment.
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| 4. | Respiratory pigment is also dissolved in the blood plasma.
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| 5. | The blood may be colourless, or have any of three different respiratory pigments.
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| 6. | The red king crab blood contains leukocytes and the second most common respiratory pigment called hemocyanin.
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| 7. | The respiratory pigment in humans is hemoglobin, which makes up most of the adult red blood cell.
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| 8. | Some gastropods, such as the sea hare " Aplysia ", appear to lack respiratory pigments altogether.
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| 9. | The blood of oligochaetes contains haemoglobin in all but the smallest of species, which have no need of respiratory pigments.
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| 10. | Detailed investigation of the haemocoel of " C . squamiferum " will reveal further information about its respiratory pigments.
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