Blood vessels are part of the circulatory system that transport blood throughout the body. They are essential for delivering oxygen, nutrients, and other vital substances to tissues and organs, as well as removing waste and carbon dioxide. Blood vessels come in various sizes and types, including arteries, veins, and capillaries, each serving different functions within the body. The study of blood vessels, known as vascular biology, is important for understanding various diseases and conditions that affect the circulatory system, such as hypertension, atherosclerosis, and aneurysms. Researchers in this field investigate the development, structure, function, and diseases of blood vessels, as well as potential therapies for improving vascular health.