(2) Sources of bases 1) products of metabolism (small amounts Such as ammonia(nh3) 2)dietary intake (vegetables and fruits sodium citrate acids production >>bases, in commen renal reabsorption(2) Sources of bases 1）products of metabolism （small amounts）Such as ammonia (NH3 ) 2）dietary intake（vegetables and fruits） sodium citrate *acids production >>bases, in commen *renal reabsorption