What is come to?

A vein is a tube or blood vessel responsible for carrying blood from the blood capillaries to the heart. It usually carries body waste and CO2, although some veins carry oxygenated blood (such as the pulmonary vein).

Unlike arteries, the precise location of veins varies greatly from individual to individual. Veins, on the other hand, are located more superficially than arteries (i.e. closer to the skin). Another difference between veins and arteries is that the former have a thinner wall. Veins are made up of three layers: an outer (also called adventitia), a middle (muscular) and an inner (endothelial) layer.

In addition to the aforementioned pulmonary veins (which carry oxygenated blood from the lungs to the heart), other important veins in the human body are the vena cava (which divides into the superior – receiving blood from the upper half of the body – and the inferior – making blood from the organs located below the diaphragm-), the portal vein (whose trunk is inside the liver), the jugular vein and the femoral vein. Specifically, we can make a great classification where the veins are organized according to the system in which they act. So, in the first place, we find those that are part of the so-called general system, which are the ones through which the blood that has less oxygen circulates and makes it from the capillaries to the right side of the heart. These stand out for having a series of semilunar valves responsible for ensuring that the aforementioned blood does not return to the aforementioned capillaries. Secondly, there are the veins of the pulmonary system in which, as the name implies, the corresponding blood with oxygen travels from the lungs to what is the left engine part of the body, the heart. And finally, thirdly, we would have to talk about the veins of the portal system. They are in which blood circulates from one capillary to another. It is important to highlight that there are, in turn, two types of systems of this type: the hepatic portal system and the pituitary portal system. Among the most common diseases of the veins are varicose veins (which are dilatations that are characterized by preventing the normal return of blood to the heart), thrombosis (which is noticed by the appearance of a clot inside the blood duct) and phlebitis (the swelling of the vein walls), among many other disorders that can affect people. In addition to all that has been said, we can determine that the term in question has other meanings and meanings. So this is also used to determine a person’s mood or mood swings. An example would be the following: Manuel defines himself because he has a negative streak that causes everything around him to be seen by him with pessimism and sadness.

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