Question: Ensweni yomuntu, i-urea evela egazini ihlungwa ngontwentwesi lwama-glomerule ibe yi-nephron. Ukudabula kwe-urea kulolu ntwentwesi kwenzeka ngaphandle kokusebenzisa i-energy. Yisiphi isici okungenzeka kakhulu ukuthi siyisizathu sokuthi ukumuncwa kwe-urea kungayidingi i-energy?
Options:
ukungalingalingani kwe-pH
ukungafani kokucindezela
ukukhuphuka kwezinga lokushisa
i-concentration gradient
Answer: D