True about free water clearance is: (A) Regulated by ADH, (B) Regulated by aldosterone, (C) Increased by furosemide, (D) None of the above
Answer is A. ADH or Vasopressin - hormone secreted by the posterior pituitary gland and also by nerve endings in the hypothalamus; affects blood pressure by stimulating capillary muscles and reduces urine flow by affecting reabsorption of water by kidney tubules Ref: Ganong's review of medical physiology; 24th edition; page no: 690