In some unicellular eukaryotic organisms such as the amoeba, shown in Figure 1, cellular wastes and excess water are excreted by exocytosis, when the contractile vacuoles merge with the cell membrane and expel wastes into the environment.

How do amoebas excrete waste?

In some unicellular eukaryotic organisms (e.g., amoeba), cellular wastes, such as ammonia and excess water, are excreted by exocytosis as the contractile vacuoles merge with the cell membrane, expelling wastes into the environment. ... After the canals fill with water, it is pumped into the vacuole.

Does amoeba release waste?

Excretion in Amoeba: Major excretory products of amoeba are carbon dioxide and ammonia. Amoeba has specialized excretory structures for the purpose of excretion called contractile vacuoles. Physical phenomenon called diffusion helps contractile vacuoles to excrete waste products.