What is pressure?

If you feel a headache, like somethingsqueezes your head, or, on the contrary, tears it from the inside, then, most likely, you have problems with blood pressure. What is pressure? How does it happen? Now consider this issue.

Pressure is a physical quantity that characterizes the force of an impact on an object. The pressure value depends on the strength of the action (F) and the interaction area (S).

Pressure of the external world

Maybe you did not think about it, but we are pressed all the time by a huge layer of air. This is atmospheric pressure. It acts on all the bodies that are on the Earth. There are no exceptions.

The higher you climb the mountain, the lower the atmospheric pressure, measured in pascals or millimeters of mercury.

Imagine the force with which the air presses onus, it is difficult. This is a very large force. So why do we feel absolutely normal in such conditions? And this happens for two reasons: firstly, the pressure of the air column acts on us evenly from all sides, and secondly, within us, too, there is pressure, oppositely directed along the pressure vector to the atmospheric one.

Pressure inside us

According to our veins, the blood flowing inmovement of the heart contraction. The pressure that blood exerts at the time of contraction is called arterial pressure. It is also measured in millimeters of mercury.

Arterial pressure has two indicators: systolic pressure (upper, first number) and diastolic (lower, second number). To calculate the systolic pressure, use the formula: 109 + (0.5 × age) + (0.1 × weight). To determine the diastolic pressure, there is another formula: 63 + (0.1 × age) + (0.15 × weight). The two numbers obtained are your normal pressure.

On how to measure blood pressure in the human body at the moment, read this article.

With the course of evolution, living beings possessingblood, have adapted to the pressure of air masses. Thus, blood pressure (BP) is theoretically equal to atmospheric pressure - 1 kG / cm2. However, there are times when the heart works in extreme conditions, which leads to pressure jumps.

At any time you are affectedpressure from the outside and from the inside. Atmospheric pressure (external pressure) is the force with which air masses affect the area of ​​your body. The higher you are above sea level, the lower the atmospheric pressure. The normal figure is 760 millimeters of mercury.

Simultaneously with the external pressure, you experience andinternal. If it is a question of pressure of blood on the walls of blood vessels, then it is blood pressure. It is also measured in millimeters of mercury, but consists of two parameters: the pressure of the upper (inside the arteries) and the pressure of the lower (inside the veins). It is very important to monitor this indicator at the age of 12 to 19 years (active growth) and from 45 years (aging).

If you experience frequent headaches, then contact your local health center. Perhaps something is wrong with your heart.

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