As the fluid continues to flow along the tubule toward the larger collecting tubule, or collecting duct, other cells in the tubule wall release additional secretions into it, including ammonia, potassium, urea, uric acid, and excess water.
ज़ाहिर है कि इसमें वे पदार्थ हैं जिनकी आपके शरीर को कोई ज़रूरत नहीं ।