👉 Blood vessels are specialized structures within the circulatory system that transport blood throughout the body. They come in different types, primarily categorized as arteries, veins, and capillaries, each serving distinct functions. Arteries carry oxygen-rich blood away from the heart to various tissues and organs, while veins return oxygen-poor blood back to the heart. Capillaries, the smallest and most numerous vessels, facilitate the exchange of nutrients, gases, and waste products between blood and tissues. These vessels are lined with endothelial cells that help regulate the flow of blood, maintain blood pressure, and prevent excessive leakage of fluids into surrounding tissues.
