The development of varicose veins
Our whole body is permeated with the most complicated system of highways, large, small and very small transport routes, which is delivered to every cell in the blood. Heart, cutting 60-80 times per minute, pumps about 4 liters of blood. Each group performs its function of blood vessels, and therefore it has a special structure. So, the blood rushes through the arteries at high speed, until he gets to the capillaries, which gives the tissue nutrients and oxygen. Therefore, it is sturdy walls of the arteries. It has its muscles, help push blood. As a result,, eg, carotid artery in a healthy person is able to withstand the pressure, equal to the vapor pressure in the boiler of a steam locomotive. Then, giving all the necessary, Blood collects recycled material: ballast, carbon dioxide - and comes back, to heart. But who is pushing it from the other side? She was in fact to overcome the force of gravity, to go up. At first, expansion of the chest at the entrance sucks blood up. Secondly, limb muscles, cutting, push the blood through the vessels.
But we now have a much more interesting job valve apparatus inside the veins themselves, which prevents the backflow of blood. We need it, to a point, when the heart is resting - and a fraction of a second arterial blood is not "props" from the bottom, blood in the vein does not fall back. Still, the blood flows through the veins slowly, than through the arteries. The walls of the veins are thinner and not as strong, like arteries, but a network of venous blood flow branched.
What is the valve apparatus? These "pockets". When the blood rises to the heart, they stick to the walls of the vessel and do not interfere with its current. When there is a reverse movement of the blood, they, gateways, closed path.
If you have an innate predisposition valve apparatus is weakened and no longer able to hold regurgitation. This will start the mechanism of the development of varicose. Blood drops back to feet, of deep vein penetrates into peripheral vessels subcutaneous, which are not constrained by any muscles, only skin, and therefore easy to expand and take an ugly shape. Outwardly, they look like knots and bumps.
Later constant hyperextension of the walls of veins (blood in it not only the, that should take place at the moment, but still remained after the previous heartbeat) It leads to disruption of supply throughout the region, next to the damaged vein. Because of edema excess blood through the venous wall propotevaet, skin and muscles less feed. Venous blood does not have enough nutrients, and it takes place and does not do useful here arterial blood. The situation is reminiscent zatya-de- formed repairs in the apartment. In addition to construction waste, which get in the way, there is nothing. Cells exist, if in their waste. Hence, the risk of venous ulcers. And besides, current deceleration venous blood leads to an increase in blood clotting varicose veins. So developing thrombophlebitis.
