Blood vessels are the channel or tubes through which oxygen-rich blood is transported to various body organs
The major blood vessels include the pulmonary veins, which transport oxygen-rich blood to the lungs, and the venous vessels, which transport blood to all other body organs.
Vessels also supply nutrients to all cells and tissues by transferring nutrients, oxygen, minerals and blood to them, as well as carrying blood-borne substances such as red blood cells, waste products, hormones and carbon dioxide. Each of the major blood vessels, or vessels of the liver, carries only a small amount of blood to the rest of the body and does not carry any blood-borne substances. The walls of blood vessels are composed of smooth muscle and are lined with an outer layer of thick fibrous collagen. The blood transports nutrient-rich blood cells to all organs and tissues of the body. This results in a strong and healthy blood supply.
There are two main types of arteries: deep and superficial. Superficial vessels are often called capillaries. They are thin, nestled deep in the skin, and can reach several feet. They are called venules. The deeper arteries, deep under the skin, provide the main blood supply to various parts of the body.
The major veins are the ones which carry the oxygen-rich blood to the rest of the body. The smallest of the blood vessels is the pulmonary vein. It runs along the pulmonary artery, which is located on either side of the chest. It is one of the most important veins in the body. The lung provides oxygenated blood to the body's organs. The pulmonary veins also provide blood-borne nutrients, such as vitamins, minerals, and water to the tissues in the lung.
The smaller veins are the venous blood vessels. There are four types of venous vessels, namely the venous capillaries, the veins in the leg, the veins in the foot and the large intestine. The venous arteries carry oxygen-rich blood from the lungs to other body organs, including the heart, spleen, pancreas and liver.
The walls of the body are also covered with specialized tissue called arterioles. The arterioles provide protection against the passage of blood through the venous walls. These structures are also the site where nutrients and blood are transported to and from the various body parts.
Besides the arterioles, there are several special cells called leukocytes which produce the fluid that coats the arteries, helping to transport blood to and from the venous structures. These include white blood cells, platelets, and lymphocytes. These are called the major components of the immune system. There are other specialized vessels called microvascular system, which helps transport nutrients, blood, waste material, and nutrients to different parts of the body. These include the tunica media, submucous linings and extra-marital channels.
A number of mechanisms are involved in the production of blood and these include the generation of proteins by cells in various types of cells, the clotting of blood, regulation of hemoglobin, the formation of fibrin, the formation of coagulation factors, and formation of platelets and other antibodies. In addition, blood also contains blood-borne substances, which is called albumin, albuminous, and lipids, which are needed for proper functioning of the digestive system. and metabolism. The proteins and albumin have specific functions in the body's system of elimination.
Blood is constantly circulating in the body. However, certain conditions or changes in the body can block the circulation and thus reduce or completely halt the supply of blood. Such changes or conditions are usually brought about by illness or trauma or by the use of medication or drugs.
The primary causes of vascular disorders are infections and diseases, poor diet and lack of physical exercise, and high doses of medication, poor blood circulation, and excessive intake of alcohol or sedatives. Other causes include smoking and poor nutrition, hereditary, poor body composition and poor circulation. Certain diseases, such as hypovolemia, may also lead to the reduction of the flow of blood.
The normal functioning of the blood vessels depends on the presence of a balance of the components of the blood: platelets, white blood cells, and plasma (fibrin). A patient suffering from arteriosclerosis, a disorder of the arteries, has an increased risk of cardiovascular complications, particularly when the vessel walls rupture or bleed because of inflammation and the walls of the artery to narrow due to the disease. Blood loss in patients suffering from arteriosclerosis is termed as atherosclerotic nephritis.