Blood vessels are essential components of the circulatory system, responsible for transporting blood throughout the body. They include three main types: arteries, which carry oxygen-rich blood away from the heart; veins, which return oxygen-poor blood back to the heart; and capillaries, tiny vessels that facilitate the exchange of oxygen, nutrients, and waste products between blood and tissues. The function of blood vessels is crucial for maintaining overall health. They help regulate blood pressure and flow, ensuring that organs receive the necessary oxygen and nutrients. Additionally, blood vessels play a role in thermoregulation, helping to maintain body temperature by adjusting blood flow to the skin.