Functions of Veins

A vein is a flexible blood vessel that transports bloodstream from different regions of the entire body to the heart. Veins are parts of the cardiovascular system, which circulates bloodstream to supply vitamins and minerals to the cells of the whole body. Contrary to the high pressure arterial system, the venous wholly system is a low pressure system that depends on muscle contractions to bring back bloodstream to the heart. Often vein problems may appear, mostly due to either a blood clot or a vein defect.

Vein Types:

Veins can be categorized into four main types: pulmonary, systemic, superficial, and deep veins.

  • Pulmonary veins carry oxygenated blood from the lungs to the left portion of the heart.
  • Systemic veins bring back deoxygenated blood from the whole of the body to the right portion of the heart.
  • Superficial veins are found near to the surface of the skin and are not situated near a corresponding artery.
  • Deep veins are found deep within muscle tissue and are generally situated near a corresponding artery with the similar name (for instance coronary arteries and veins).

Vein size:

A vein can vary in size from 1 millimetre to 1-1 .5 centimetres in inside diameter. The tiniest veins in the body are known as venules. They obtain blood from the arteries by means of the arterioles and capillaries. The venules branch into superior veins which finally transport the bloodstream to the major veins in the entire body, the vena cava. Blood is after that delivered from the superior vena cava and inferior vena cava to the right atrium of the heart.

Functions of Veins:

Functions of Veins

Veins carries blood flow back to the heart:

Veins are blood vessels that bring back blood flow from all the body parts towards the heart. When the several organs utilize oxygen from the bloodstream to do their functions properly, they produce the utilized blood having metabolic waste (like carbon dioxide) into the veins. Blood in the veins is after that carried to the heart and went back to the lungs, where the waste materials like carbon dioxide is discharged and more oxygen is loaded by the bloodstream and released back to the other of the body by the arteries.

Functions as a storage space for fresh blood:

Veins moreover function as a storage space for fresh blood. When the entire body is relaxing, merely a part of the available blood in your body circulates. The relax of the blood stays non-active in the veins and gets into the effective circulation when the body gets more energetic and needs the extra blood to deliver oxygen to the whole body. This storing capability is because of the elasticity (flexibility to expand) of the tied walls of the veins.

Veins sizes are really helpful:

Veins have several sizes based on their place and also the function. The major veins are found in the centre of the body or heart; these accumulate the bloodstream from the rest of the smaller veins and direct it into the heart. The limbs of these substantial veins get lesser and lesser as they get away from the heart. The veins basically nearer to the skin surface and are known as superficial veins. The veins which are deeper and close to the centre of the body are named deep veins. There are extra veins that hook up the superficial veins to the deep ones that are generally known as the perforating veins.


  • Veins carries blood flow back to the heart.
  • Functions as a storage space for fresh blood.
  • Veins sizes are really helpful.



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