Abstract: The invention relates to a method for cultivating living cells 6 in a liquid 5, wherein the cells 6 are introduced into at least one culture cavity 3, which is connected with at least one reservoir 2 for the liquid 5. The invention further relates to an apparatus 10 for cultivating living cells 6 in a liquid 5, which comprises at least one culture cavity 3, which is, via at least one connecting element 11, connected with at least one reservoir 2 to hold the liquid 5. In that, according to the invention, it is provided that the volume of the liquid 5 is kept constant in at least one culture cavity 3, preferably by a valve-like mechanism arranged in the connecting element 11.