Difference Between Arteries and Veins

difference between arteries and veins

Arteries and veins are the essential part of the body that performs the similar functions but different in nature. Here it is the point of study in the human body where the blood transportation is committed by veins and arteries. These organs are responsible for borrowing blood from one point to another but the characteristics and properties of blood are invariant in the category. Oxygenated bloods are carried away from the heart to the remaining part of the body by the arteries while the deoxygenated blood are reverting to the heart via veins. The protective coverings and linings of arteries are different from veins and comparatively the veins comprise of thinner walls. These two organs of the human body are just opposite in functions and studied elaborately in biological science. Both of them are essential in terms of carrying the body fluid from one part to another part to keep the balance of purity of blood. Moreover, the structural outlook also evokes their differences and shows their usual difference between arteries and veins.

Difference Between Arteries and Veins

There are innumerable differences between the blood carriers of our body system. There are two types of carriers such as veins and arteries. Both of them have the tendency to flow the body fluid but are different from each other by the type of fluid. They have different appearance and functions. The major differences between arteries and veins are compiled below.


  • Arteries are generated to carry the oxygenated blood from the heart centre to the rest part of the body.
  • The wall of arteries is made of 3 existing layers and that is why it is much 3thicker than the normal diameter of veins.
  • Arteries have 2 different patterns of vessels and they are respectively systemic arteries and pulmonary arteries.
  • When the oxygen level is reduced in the blood level, the possibility of blockage will increase in arteries.


  • The main objective function of veins is that it carries deoxygenated blood from rest of the body cell to the lung.
  • It is generally made of less thick layers and that is why it looks thinner than arteries according to the structure.
  • Veins are also composed of two distinct types of blood vessels, which are defined by Pulmonary veins and systemic veins.
  • Clotting of blood is one of the common health issues that happen in veins due to any external or internal damage.

Now let’s get the detailed information about all the difference between arteries and veins:

  1. The Blood They carry
  • Arteries

It is biologically proved that arteries are designed to carry oxygen-rich blood by default. They take away the oxygenated blood from the centre of the human heart to the cell or tissues of the rest part of the body. The main part of the artery that is the junction point of heart and artery network is called aorta and comes out of the heart to oxygenate our body with sufficient pure blood. The body needs the oxygenated blood to perform other biological functions and that need is completed by the valuable service of arteries. The requirement gets fulfil by the artery, which carries oxygen mixed blood from the heart to rest body cells or tissues.

  • Veins

On the opposite end, veins are known for carrying carbon dioxide rich blood or deoxygenated blood from the various tissues or cells to the right atrium. Then biologically the procedure will follow to enter the blood fluid into the right ventricle and eventually into the lungs for soaking oxygen and to convert it to carbon dioxide. Meanwhile, the blood generally flows to left atrium via the pulmonary path. Following the continuing procedure, it enters from left atrium to left ventricle and collects oxygen again according to the biological procedure. This will help you know the difference between arteries and veins.


  • Arteries

The artery has been made of three different layers, which are termed as respectively tunica internal, tunica media and tunica external. Due to these three layers, the walls of arteries are much bulky and thicker than veins. Moreover, the operating pressure of this artery is too high than that of veins. In addition, according to the structural difference, the arteries do not consist of any valve as like as veins.

  • Veins

Compared to arteries, veins are made of the thinner wall. In between the thinner layers of veins, the maximum thick wall is known as tunica adventitia. The construction of veins comprises of one directional valve that is a semi lunar valve, which helps to prevent the backwards flowing of body fluid when it generally travels to the lungs or heart. One of the most common and biological differences between veins and artery is that the inner pressure of blood flow in veins is much lesser than that of arteries. As a result, the portion of smooth type muscles inside the wall of veins is not developed so well as equivalent to the development inside the arteries.

3.Types of Blood Vessel to understand difference between arteries and veins

  • Arteries

Arteries are made of two various types of blood vessels such as pulmonary blood arteries and systemic blood arteries. The functions of these types of arteries are different and distinct from each other.  Systemic arteries are found to carry out the oxygen-rich blood from the heart to tissues of the rest part of the body. On the other hand, the second type of arteries like pulmonary artery is known to borrow deoxygenated blood. They carry it out from the right ventricle (of heart) to lungs to repeat the process of oxygenation this volume of blood again.

  • Veins

Veins consist of two different types of blood vessels and they are respectively pulmonary veins and systemic veins. Systemic veins are responsible for carrying out so little oxygenated blood from body cells to lungs or heart. Moreover, it consists of deep and superficial systemic veins. Nevertheless, the pulmonary veins are known to carry oxygenated blood from lungs to the part of the left atrium of heart. This process is the initial step to release the pure blood via arteries to the whole body.


  • Arteries

The main disease that arteries can face is the blockage due to which a serious health injury can appear. It is susceptible to get attacked by cholesterol plaques, which is termed in biology as atheroscleotic arterial vascular disease. If the blockage happens once, it can reduce the supply of oxygen to the required domain of body results in damaging definite body parts. This helps in the difference between arteries and veins.

  • Veins

Veins disease does not include cholesterol plaque but in opposite sense can avail the disorder of thrombosis that is related to clotting of blood. The appearance of thrombosis in deep veins can become so much dangerous for human and are called deep vein thrombosis.

How Are Arteries and Veins Connected?- Understand the difference between arteries and veins

Although, there are lots of differences between arteries and veins according to their structure and functions, they are connected with each other at some points. The formation of capillaries is generated at the last pint of the extension of veins and arteries where they get small and thin enough to get connected with each other. At the capillary point, both the blood vessels are connected. At the capillary point the exchange of oxygen and carbon dioxide happens and from that point, the blood is brought back to the heart with the intention of purification.