The squid uses its mantle to support it's circulatory system, but also for locomotion and respiration. The negative pressure created in the mantle when the squid expands helps to move blood and sucks in oxygenated water. When the mantle contracts, it expels deoxygenated water which can also work as propulsion. Also the circulatory system works with the urinary system by using the nephron organ which acts as a kidney in the urinary system, but as a filter in the circulatory system.
Cool Fact!!! Squid blood is mainly made of copper, which is more abundant in the ocean. When the blood is oxygenated, it is blue, but when it is deoxygenated, it turns clear.
Very cool image...can you add the URL in the comments. What problem(s) do these systems solve? You have multiple functions for the same structures, but can you clarify the integrated systems in solving one problem? You could also think of them in terms of a characteristic of life...
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