Using your vast knowledge of the excretory system

Using your vast knowledge of the excretory system, cause a change to the collecting duct that might happen if the person’s brain detects that the blood concentration has become too concentrated. Describe what you did and its effects on the collecting duct. Explain the importance of the loop of Henle to this function of the collecting duct. Now carry out a bit of negative feedback and bring the duct back to the state if the blood concentration was balanced. What did you do?