Question

How do ADH and RAAS work together in maintaining osmoregulatory homeostasis?

• A. ADH monitors osmolarity of the blood and RAAS regulates blood volume
• B. ADH monitors appropriate osmolarity by reabsorption of water, and RAAS maintains osmolarity by stimulating Na+ reabsorption
• C. ADH an RAAS work antagonistically; ADH stimulates water reabsorption during dehydration and RAAS removal of water when it is in excess in body fluids
• D. Both stimulate the adrenal gland to secrete aldosterone which increases both blood volume and pressure

Answer 1

The correct option is B ADH monitors appropriate osmolarity by reabsorption of water, and RAAS maintains osmolarity by stimulating Na+ reabsorption

ADH (Anti diuretic hormone) and RAAS (Renin Angiotensin Aldosterone System) work to maintain blood pressure.
ADH increases the reabsorption of water in the DCT and collecting ducts and hence maintains the osmolarity of water.
RAAS is operated by JGA which increase blood volume by stimulating NaCl reabsorption.