Body knows how to regulate and monitors its blood pressure. There are special sensors in the walls of the arteries and heart that feel blood pressure. Baroreceptors, the title of sensors. Baroreceptors sense Blood Pressure & later send signals to the heart, the arterioles, the veins, and the kidneys which force these organs to bring in changes that lower or increase blood pressure. There are several methods in which blood pressure can be regulated:

The ejection of blood will be more with every contraction if heart increases speed and shrinks quickly. It finally cause high blood pressure due to elevated blood flow into the arteries due to these responses.

Veins perform two movts expansion and contraction. When expansion movt is executed more blood get collected in the veins and the heart can not have adequate blood. This leads to lower blood pressure as the heart gives out less blood. Differently, When and if the veins contract, less blood is collected in the veins, most of the amount of blood returns to Heart for pumping into the arteries, and, therefore, the heart pumps more blood & BP is greater.

The arterioles perform two movts contraction & expansion. Extended arterioles form lower resistance to the flow of blood & decrease BP while shrinked arterioles create more and more resistance and increase blood pressure.

Increasing or decreasing amount of urine could even signify the changes in blood pressure. Urine is basically amount of water that is taken out of blood hence when a kidney produces additional urine, volume of the blood which pumps up the arteries and veins goes down, & this reduces BP.