Interesting facts about blood circulation and venous system
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 systemIs the heart - a vital muscular organ, continuously pumping oxygenated blood for normal cell activity. This is a very important system, because the nutrition of all cells is dependent on its functional functioning.
As soon as the supply of cellsNutrients, the blood returns back to the heart, entering it on the upper and lower hollow veins. Then, after being saturated with 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 the necessary nutrientsSubstances 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 delivery of nutrients begin 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 the flow of blood. 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 the normal vital activity of all cells in our body.
Force of gravity
Most of the time we spend standing or sitting and very rarely lie face down. Therefore, the main obstacle that overcomes the veins, returning blood to the heart, is the force of attraction.
Arteriam is much easier to do its job, as it 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 attractionThe venous system must have other resources. For example, when we run or go, the pressure exerted by the nasal arch (curved part of the soles of the foot) allows the blood to rise towards 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. We determined the basic function only - give the first impulse of blood so that the latter would rise to the heart.
On the other hand, at the disposal of the venous systemThere are other means designed to ensure the correct return of blood to the heart. The ventral calf muscles contract at a contraction in size, exerting pressure on the deeper veins with which they touch, thus pushing the blood to the heart.
There are small valves on the inner side of the veins(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 networks
The venous system consists of a huge number of veins of different dimers, distributed throughout the body.
As for the general system of 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.
- Surface network conducts 10% of blood andBranched into the subcutaneous tissue. It is in this network, formed by subcutaneous and superficial sores, that varicose veins usually develop in the first place. 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 present a problem for the circulatory system.