To solve this problem, we need to analyze each statement and determine which are correct:$\newline \bullet$A. An excessive loss of body fluid from the body switches off osmoreceptors.$\newline$ - This statement is incorrect. Excessive loss of body fluid actually activates osmoreceptors, which in turn stimulate the release of ADH to conserve water.$\newline \bullet$B. ADH facilitates water reabsorption to prevent diuresis.$\newline$ - This statement is correct. ADH (antidiuretic hormone) increases the permeability of the kidney's collecting ducts to water, promoting water reabsorption and reducing urine output.$\newline \bullet$C. ANF causes vasodilation.$\newline$ - This statement is correct. ANF (atrial natriuretic factor) is a hormone that causes vasodilation and reduces blood pressure.$\newline \bullet$D. ADH causes an increase in blood pressure.$\newline$ - This statement is correct. By promoting water reabsorption, ADH increases blood volume, which can lead to an increase in blood pressure.$\newline \bullet$E. ADH is responsible for a decrease in GFR.$\newline$ - This statement is incorrect. ADH primarily affects water reabsorption and does not directly decrease the glomerular filtration rate (GFR).$\newline$Based on the analysis, the correct statements are B, C, and D.$\newline$Therefore, the correct answer is Option 2: B, C and D only.