Among them were your kidneys. When you were born, your kidneys were ready to filter your blood supply ​ — removing toxins and excess water but retaining useful substances.
وَهذِهِ ٱلْخَلِيَّةُ ٱلْمِجْهَرِيَّةُ ٱلْبَالِغَةُ ٱلتَّعْقِيدِ ٱلَّتِي تُشْبِهُ مُخْتَبَرًا كِيمْيَائِيًّا مُصَغَّرًا تَكَاثَرَتْ بِسُرْعَةٍ .‏