In our body passes more than 90,000 km of blood vessels transporting approximately 4.5-5.5 liters of blood.
The neuralgic center of this wonderful system is the heart - a vital muscular organ that continuously pumps oxygenated blood for normal cell activity. This is a very important system, because the nutrition of all cells depends on its functional functioning.
As soon as the supply of cells with nutrients occurs, the blood returns to the heart, entering it through the upper and lower hollow veins. Then, after being saturated with light oxygen, the blood continues its movement throughout the body.
Interesting facts about blood circulation
- Movement of blood on the heart lasts 4 seconds.
- Blood circulation to the lower extremities takes about 18 seconds, and to the brain - about 8 seconds.
- About 3,000 circles of the circumcirclement occur daily.
- The length of our blood vessels is more than 90,000 km. This means that they could be wrapped around the earth more than twice.
- The density of the capillary system is 2500 capillaries per square millimeter of tissue.
Arteries - vessels responsible for cellular life
Getting the cells of all necessary nutrients completely depends on the normal blood circulation. And it is the arteries that are responsible for the delivery of these nutritional components. In the event that the supply of nutrients begins to malfunction, the cells experience discomfort, forced to independently seek a way out of unforeseen circumstances. At first they can continue to perform their work, despite the irregularity of blood flow. But of course, this is the limit. Basically arteries transport mineral substances, enzymes, vitamins, sugars, fats and oxygen, that is, the basic components necessary for normal vital activity of all cells in our body.
Force of gravity
Most of the time we spend standing or sitting and very seldom lie face down. Therefore, the main obstacle that overcomes the veins, returning blood to the heart, is the force of attraction.
The arteries are much easier to do their job, as this is facilitated by cardiac depletion, necessary for the movement of blood for the body. In the veins, on the contrary, the pressure is weakened.
Therefore, to overcome the force of attraction, the venous system must have other resources. For example, when we run or go, the pressure exerted by the nascent arch (curved part of the soles of the foot) allows the blood to rise toward the heart. At this time, the mechanism of the venous suture comes into play, so called because it is a zone with a dense network of veins. The main function we have just defined is to give the first impulse of blood in order that the latter should rise to the heart.
On the other hand, there are other means at the disposal of the venous system designed to ensure the correct return of blood to the heart. The ventral calf muscles contract in size while increasing, exerting pressure on the deeper veins with which they touch, thus pushing the blood to the heart.
On the inner side of the veins, there are small valves (they do not have arteries), which direct the veins to the heart. Finally, the least important is the function of respiration, which gives an impulse for the movement of blood when the diaphragm is raised to the abdominal cavity.
Deep and superficial venous nets
The venous system consists of a huge number of veins of different dimers, distributed throughout the body.
As for the general system of the lower extremities of our body (legs), it should be divided into two networks.
- A deep network is responsible for transporting the blood that has already washed muscles. Veins of a deep network deliver to the heart 90% of the blood.
- The superficial network spends 10% of the blood and branches into the subcutaneous tissue. It is in this network, formed by subcutaneous and superficial sores, that varicose veins usually develop primarily. The positive point is that since the superficial system is not designed to transport large amounts of blood, the removal of varicose veins does not pose a problem for the circulatory system.
Be healthy!