Human: What are the different types of blood vessels in the human body? Assistant: 
The different types of blood vessels in the human body include arteries, veins, capillaries, and lymphatic vessels. Arteries carry oxygenated blood away from the heart to the rest of the body, while veins carry deoxygenated blood back to the heart. Capillaries are small vessels that link arteries to veins and provide a pathway for the exchange of gases and nutrients between the two systems. Lymphatic vessels transport lymph fluid throughout the body.