The renal tubule would be the vessel within the nephron loops that functions to collect ions and water back into the blood. In addition, these vessels are the one responsible for emptying the collecting duct and reabsorbs salts present in the bloodstream and disperses it back to the blood.
Hypocalcemia or low calcium level is most usually the cause of electrolyte disturbance after a thyroid surgery.
Answer: Single celled eukaryotic organism