The concept of blood pressure is the one that is applied to the force that the bloodstream exerts on the spaces through which it circulates (capillaries, veins, arteries) to distribute itself throughout the body. The circulatory system of animals is based on the permanent and constant circulation of blood flow from the heart to the most distant places always through the veins or arteries. This circulation has a rhythm that can vary depending on very different factors and that marks the blood pressure.
Blood pressure is, as has been said, the force with which blood flows through the different arteries and veins of each organism, reaching from the farthest points towards the heart and vice versa. This pressure can be of two main types: venous pressure, that is, which occurs in the veins, and arterial pressure, which occurs in the arteries, ducts larger and thicker than the veins. Blood enters the heart from the flow of movement that occurs in these conduits known as veins and arteries and there is purified to be re-sent again, generating a force known as blood pressure.
Although this depends on and varies with each animal, the blood pressure considered normal within the medical parameters for humans is from 90/55 mm Hg up to 119/79 mm Hg. The two main numbers are those that represent systolic or high blood pressure (when the heart contracts in motion) and the two low numbers represent diastolic or low blood pressure (when the heart expands). It is very important for the health of the person to monitor these numbers because pressures above or below them can indicate the presence of serious complications such as hyper or hypotension.
It is important to note that blood pressure varies depending on the part of the body. Inside the aorta, which receives blood constantly pumped through the heart, a mean pressure of 100 mm Hg is recorded, while at the end of the vena cava it drops to almost 0.
