Through the contractile vacuole in the ciliate occurs …

The ciliate shoe is the simplest single-celled organism, which, however, is capable of performing all the functions characteristic of all living organisms. The habitat of ciliates-shoes is water bodies. One of the organelles of the ciliates is the contractile vacuole, through which substances unnecessary to the body are removed and the remains of undigested food are excreted. It is this organoid that allows the ciliates not to accumulate excess substances within the cell itself.