The 8 differences between veins, arteries and capillaries

All the vital functions of the human body and all the psychological processes such as thinking, feeling and acting would not exist if the circulatory system did not do its job. However, this part of the body is not a homogeneous thing, but is made up of different types of ducts, branches that cover almost every tissue in the body and keep cells alive by providing them with oxygen and the materials they use. need.

Below we will see the difference between arteries, veins and capillaries, And the way these little pipes allow us to live.

    Circulatory system

    While all cells in the human body work with relative autonomy, fulfilling their small role, they need the participation of something that goes beyond their own individuality. Not only do you need to be in a stable environment created by the surrounding membranes, but you also need to have a constant supply of oxygen and materials to stay operational.

    This last task, among others, is precisely in charge of the circulatory system. It consists of veins, arteries and capillaries, as well as through the heart, the organ that contributes to blood circulation through the interior of these organic ducts.

    On the other hand, the blood also acts as a communication channel, not only to nourish the cells. More precisely, it transports hormones from side to side, causing them to be received by their respective target organs to awaken a change in them: a contraction, the segregation of several hormones, the adoption of another form, etc.

      The difference between arteries, capillaries and veins

      The main differences between veins, capillaries and arteries (all parts of the circulatory system) are as follows.

      1. Capillaries do not have muscle walls

      Capillaries are the best conduits in these three categories, From afar. On the other hand, its walls are not associated with muscle tissue.

      2. The veins return to the heart, the arteries come out

      Arteries are the first type of conduit blood passes through after passing through the heart. The veins, on the other hand, are the entry conduits.

      3. The capillaries perform the function of “bridge”

      The capillaries are located between the veins and the arteries. In other words, they are branches that come out of the arteries and come together to form veins.

      4. Arteries maintain blood pressure

      The arteries they circulate the blood while maintaining the pressure inside the heart. Inside the veins, on the other hand, this pressure does not occur, and the same goes with the capillaries.

      5. In the capillaries there is an exchange of substances, in the veins and arteries, not

      The capillaries, in addition to being the narrowest ducts, they also have very thin walls, Ideal for certain substances to pass through them. This is exactly what happens: there are particles that leave the blood to reach the target cells, and others enter the bloodstream through them.

      In this way, cells get the resources to live and, on the other hand, hormones can get into the blood and navigate there until they reach their destination.

      6. Arteries regain their shape when crushed, veins and capillaries fail.

      The walls of the arteries are thicker than those of other channels of the nervous system, and they easily keep their shape.

      7. The veins carry non-oxygenated blood, the other two, with oxygen

      As it is their turn to return to the heart, the blood carried by the veins he has already lost his oxygen along the way, And for this it must be brought back to the lungs in the areas occupied by the alveoli.

      8. Veins have valves

      As the blood flowing through the veins is not subjected to the pressure generated by the pulse of the heart, it is transported to its destination. by means of a valve system that prevent this liquid from going in the opposite direction to where it needs to go.


      Although these types of behaviors are similar in the most basic, they neither have the same properties nor perform the same function. Whether by shape, by their parts, or by the role they play in the circulatory system, they are easy to distinguish both in image and live, working on their tasks.

      Of course, you have to keep in mind that an injury, for example, does not have the same repercussions if it occurs in an artery, vein or capillary. The latter are the most durable, being so narrow that they are often out of reach of human sight and their breakage as a whole. it will produce bruising, but usually not much more. On the other hand, a cut in the other two can be fatal.

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