Question

Are blood vessels cells?

Answer 1

Blood vessels are channels or channels through which blood is distributed to body tissues. The vessels make up two closed systems of tubes that begin and end in the heart. One system, the pulmonary vessels, carries blood from the right ventricle to the lungs and back to the left atrium.

Complete answer:
The blood vessels are the components of the circulatory system that carry blood throughout the human body. These vessels transport blood cells, nutrients, and oxygen to the body's tissues. They also remove waste and carbon dioxide from the tissues. Blood vessels are needed to sustain life because all body tissues rely on their functionality.

There are five types of blood vessels: the arteries that carry blood away from the heart; the arterioles; the capillaries where there is an exchange of water and chemicals between blood and tissues; the veins; and the veins that carry blood back to the heart from the capillaries.

There are three layers of arteries and veins. The middle layer is thicker in the arteries than in the veins: The inner layer, the intima tunica, is the thinnest layer. It is a single layer of fl4at cells (simple squamous epithelium) glued together by a polysaccharide intercellular matrix, surrounded by a thin layer of subendothelial connective tissue interlaced with several circularly arranged elastic bands called the internal elastic lamina. A thin membrane of elastic fibers in the tunica intima runs parallel to the vessel.

The middle layer of the tunic medium is the thickest in the arteries. It consists of circularly arranged elastic fiber, connective tissue, polysaccharides, and the second and third layers are separated by another thick elastic band called external elastic laminate. The tunic media (especially in the arteries) may be rich in the smooth muscle of the vascular, which controls the caliber of the vessel. The veins don't have the external elastic lamina, but only an internal one.

The outer layer is the adventitia tunica and the thickest layer in the veins. It's made entirely of connective tissue. It also contains nerves that supply the vessel and nutrient capillaries (vasa vasorum) in larger blood vessels.Endothelial cells form a single cell layer that binds all blood vessels and regulates exchanges between the bloodstream and surrounding tissues.

Note: Blood vessels play an enormous role in virtually every medical condition. Cancer, for example, cannot progress unless the tumor causes angiogenesis (formation of new blood vessels) to meet the metabolic demand of the malignant cells. Atherosclerosis, the formation of lipid lumps (atheromas) in the wall of the blood vessel, is the most common cardiovascular disease, the leading cause of death in the Western world.