The sensation of thirst and the regulation of body fluid balance

Can you explain the physiological mechanisms underlying the sensation of thirst and the regulation of body fluid balance, including the roles of osmoreceptors, antidiuretic hormone (ADH), and the renin-angiotensin-aldosterone system (RAAS)? How do changes in plasma osmolality and extracellular fluid volume stimulate osmoreceptors in the hypothalamus and baroreceptors in the cardiovascular system, triggering thirst sensations and ADH release to promote water intake and retention? Additionally, how does the RAAS respond to changes in blood pressure and blood volume to regulate sodium reabsorption and fluid balance via aldosterone secretion and angiotensin II-mediated vasoconstriction? Furthermore, how do dysfunctions in thirst regulation and fluid homeostasis contribute to conditions such as dehydration, hyponatremia, and heart failure?