Nhengodzivo inobvinina norusarura (selectively permeable membrane or semipermeable membrane in English) zvinoreva rukanda runotendera mheu dzimwe kudarika asi rusingatenderi dzimwe mheu kudarika. Rukanda rwemhando iyi runoshanda apo madzinde anosveta mvura kubva muvhu ichikwira nemunhengo dzawo kusvika kumashizha muchiitiko chemusenerera. Nokumwe kutaura tingati membrane rukanda runosarura zvinobvinina.