thread veins Veins of the Human Body

Veins of the Human Body

The veins of the human body are blood vessels that are part of the circulatory system of the organism and branch through the whole organism.

The main function of the veins is to transport blood, poor in oxygen and full of waste, from the capillaries to the heart. Note that the types of blood vessels are classified into: arteries, veins and blood capillaries.

Venous Blood and Blood Blood
The venous blood is that rich in carbon dioxide, that is, it is poor in oxygen. Circulates from the systemic pathways and pulmonary arterial tree to the heart.

In turn, the arterial blood is rich in oxygen, circulates through the pulmonary veins and systemic arteries, transporting the blood out of the heart.

Veins Structures
Veins of the Human Body

The veins are tubes formed by venous valves that prevent the reverse flow of blood. They have three layers of wall called: tunica intima (connective tissue), tunica media (muscle tissue and elastic tissue) and tunica adventitia (flexible connective tissue).


Major Veins of the Human Body
Lung Veins: These veins carry oxygen-rich blood from the lungs to the left atrium of the heart.
Vein Cava: The veins cavas (upper and lower) are responsible for bringing the poor blood into oxygen (rich in carbon dioxide) from the body to the right atrium of the heart. In the meantime, the superior vena cava carries blood from the lower part of the body, while the inferior vena cava carries blood from the upper part of the body, or rather from the head and upper limbs.
Jugular vein: This vein is located in the neck and its function is to transport the venous blood (rich in carbon dioxide and low in oxygen) from the skull to the parts of the body.
Vein Safena: major veins of the venous system, the saphenous veins are responsible for carrying blood from the top down.
Read too:

Arteries
Blood vessels
Blood
Circulatory system
Cardiovascular system
Diseases in the veins
Varicose veins
Varicose veins are dilated veins that appear in the lower limbs causing pain, swelling, deformities and loss of sensation. Although it is more common in women, men also have varicose veins.

Nevertheless, varicose ulcers are characterized by accumulation of venous blood, lack of oxygenation, increased pressure and accumulation of toxins.

Phlebitis
Phlebitis, also called venous thrombosis, is characterized by inflammation that occurs in the wall of the veins, causing swelling, pain and feeling of heaviness in the legs.

It is worth mentioning that there are two types of phlebitis, namely: superficial phlebitis, characterized by visible veins; and deep phlebitis, marked by deeper veins.

Curiosities
The study of veins and treatments of blood vessels is called phlebology.
The vein has thinner walls than the arteries as they undergo less pressure.
The diameter of the veins can vary, that is, some are less than 1 mm (thin veins), and others can reach up to 10 mm (thick veins).