• How does blood pressure arise?
The heart pumps blood through the body, and in doing so creates pressure on the walls of the vessels, known as blood pressure. When the heart contracts, the pressure rises, and this is what is called the high blood pressure, and when it relaxes, the blood pressure is low.
Millimeters of mercury is the unit of pressure:
Blood pressure is often measured on the forearm. The unit of measurement is “mmHg”, because the first devices to measure blood pressure were glass tubes filled with mercury. The belt is inflated to compress the blood vessels until the blood flow stops.
• How do we determine the upper and lower values?
When the air is gently emptied, the blood begins to flow again, and its sign is the familiar sounds resulting from the eruption of blood. Here is the high value of pressure. And when the blood returns to flowing unhindered, these sounds stop, so we get the low value of blood pressure.
High pressure in the state of relaxation is dangerous:
Great effort and stress raise blood pressure for a short time. Blood pressure is harmful to health when it is high in times of relaxation as well. In general, the pressure is high when it is more than 140 over 90, but the matter varies from one case to another and is related to age and lifestyle.
• The first measurement of pressure 300 years ago:
The first pressure measurement process took place almost 300 years ago and was performed on the horse in a violent way when British Stephen Hills placed a glass tube in the carotid artery of the horse to measure its pressure. As for the current method, it belongs to the Russian Sergeyev, who developed this process to become a simple and regular process.
