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The contractile vacuole is basically a water bubble within the endoplasm of A. proteus. It's function is to regulate the water content of the cell. It is also a means of excreting its waste from the cell (out through the cell membrane) VIA diffusion. ... Without the contractile vacuole, the amoeba may burst.

This small protozoan uses tentacular protuberances called pseudopodia to move and phagocytose smaller unicellular organisms,(which may be greater in size than of amoeba), which are enveloped inside the cell's cytoplasm in a food vacuole, where they are slowly broken down by enzymes.