Discuss the regulation of blood pressure by the cardiovascular system, including the role of the baroreceptor reflex, renin-angiotensin-aldosterone system, and vasopressin. Start by explaining how baroreceptors in the carotid sinus and aortic arch detect changes in blood pressure and transmit signals to the cardiovascular control center in the brainstem. Elaborate on the reflexive responses to maintain blood pressure within a normal range, such as vasodilation or vasoconstriction. Then, detail the renin-angiotensin-aldosterone system’s activation in response to decreased blood pressure or blood volume, leading to vasoconstriction and sodium reabsorption to increase blood pressure. Next, discuss the role of vasopressin (antidiuretic hormone) in regulating water reabsorption by the kidneys to adjust blood osmolarity and volume. Finally, address the long-term regulation of blood pressure through mechanisms like the regulation of blood volume by the kidneys and hormonal control.