the structure and control of the blood vessels of invertrebrates
Conlon, Rita Judge
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As a large Metazoa developed, osmosis and streaming of protoplasm had to be replaced by a more efficient maintenance system. A complex arrangement of invaginations would provide sufficient absorptive area, vut no advance is possible with such a system. Circulation is an effective means of distributing materials, but a large body with an entire surface cannot absorb enough material to maintain itself. By combining systems of invaginations and circulation, however, the poor features of each system are eliminated.
Thesis (M.A.)--Boston University, 1940
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