Semipermeable or selective permeability zvinotaura chiro chinosarura mheu dzinokwanisa kudarika pakubvinina, asi chiro ichi chichidzivisa dzimwe mheu kudarika. Nokumwe kutauro kunopfupisa tinokwanisa kuti nhengopfunha inobvinina norusarura kureva iyo selective permeability.