Argument

I argue that as a hemocoel shrinks, reduced volumes of hemo-lymph compared with the volume of the cavity are to be expected in the smallest insects, because as bodies shrink, a three-dimensional volume of hemolymph reduces towards a moistened two-dimensional layer on the external surfaces of the organs and the inner surfaces of the hemocoel. Reducing the volume of liquid hemolymph reduces overall weight and the energy expended to transport the weight, as well as increases the probability that molecules diffusing in the surface films of the hemocoel reach their destinations.

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