The contribution gives a survey about the problematics of surface tension in biomedical sciences. The paper presents results of a study devoted to the cerebrospinal fluid. The distribution of the surface tension values of this liquid in healthy individuals is presented (n = 33), and further, statistically significant correlations between the cerebrospinal fluid surface tension value and 1. concentration of total proteins expressed by Spearman's coefficient p(s) = (-0.995) and 2. number of cell elements expressed through Spearman's coefficient p(s) = (-0.965) in cerebrospinal fluid are described.