Final answer:
The renin-angiotensin system, decreased release of ADH, and baroreceptor reflex-induced vasodilation are homeostatic mechanisms that act to increase blood pressure back towards normal.
Step-by-step explanation:
In response to a fall in blood pressure (BP), several homeostatic mechanisms act to increase BP back towards normal. These include the activation of the renin-angiotensin system (a), decreased release of anti-diuretic hormone (ADH) (b), and baroreceptor reflex-induced vasodilation (c). Additionally, suppression of aldosterone release from the adrenal glands (d) can also help increase BP.