Educational film for students. In figurative form demonstrates the basic laws and regulations of the industry biophysics. Each cell and the whole living organism as a whole are open systems, and only in some parts of the cell are the conditions for the existence of closed and isolated systems. Processes in biological systems, as well as in any other systems are irreversible (non-equilibrium), ie, when the system from one state to another transition back to the initial state is not possible without additional input of energy from outside.