The body mechanisms are well expert in checking and maintaining the BP of the human body. There are particular sensors in the lining of the heart and the arteries that can feel BP. Baroreceptors, the title of special sensors. Baroreceptors sense BP & then send out signs to the heart, the arterioles, the veins, and the kidneys that force these organs to make alterations which decrease or increase BP. There are numerous techniques in which blood pressure can be checked:

Elevated heart speed may cause the more quick contraction of the heart & give out more amount of blood. Eventually, high BP as both of these responses increase the blood flow into the arteries.

Veins perform two movts contraction and expansion. The time when enlargement movt is performed more blood get collected in the veins and the heart cannot get adequate blood. This leads to low blood pressure as the heart oozes less blood. But, When veins narrow, less amount of blood is collected into veins, most of the blood comes back to The heart for pumping in arteries, &, hence, heart pumps more amount of blood and BP is elevated.

The arterioles carry out 2 movements contraction & expansion. Resistance to the flow of blood comes down with arterioles enlargement and thus results in low blood pressure, likewise resistance to the blood flow inflates with arterioles shrinking and hence elevated BP.

By decreasing or increasing the amount of urine still kidney could tell you about the modifications in your blood pressure. The urine is primarily water that is removed from the blood hence when the kidney makes more urine, volume of blood which pumps up the arteries and veins reduces, & it reduces blood pressure.