The body actions are well trained in checking and holding the blood pressure of the body. There are sensors in the lining of the arteries and heart that sense BP. These types of special sensors are referred to as baroreceptors. Baroreceptors can feel Blood Pressure and later send indications to the heart, the arterioles, the veins, and the kidneys which force them to make changes which lower or increase blood pressure. There are many methods in which blood pressure can be checked:

Raised heart speed can lead to the more rapid shrinking of heart & ejects more amount of blood. It ultimately cause hypertension because of elevated flow of blood into the arteries because of these responses.

The veins could expand and narrow. The time when expansion movement is performed more blood get collected in the veins and the heart cannot get sufficient amount of blood. Therefore, the heart give out less amount of blood, and blood pressure is lower. On the other hand, When veins contract, less blood get reserved in the veins, maximum blood comes back to Heart in order to pump in the arteries, and, hence, the heart give out maximum blood and blood pressure is greater.

The arterioles may expand and narrow. Extended arterioles create smaller check to the blood flow and decrease BP while contracted arterioles create more resistance and increase blood pressure.

The kidney could respond to alterations in BP by increasing or lessening the urine amount that is formed. Urine is primarily water which is taken out from blood thus if the kidney creates additional urine, the amount (volume) of the blood that fills the arteries and veins lowers, & it reduces blood pressure.