Branchiostoma is closed type blood vascular system. Blood is colourless due to lack of any respiratorypigment and corpuscles. Blood vessels in some lymph spaces such as in metapleural folds and the dorsal and ventral fins. Its main tobe the transportation of food and excretory products rather than oxygen and carbon-di-oxide for gaseous exchance.There is no structural differences between arteries and veins due to their homologies with blood vessels of higher chordates.
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