Which vessels form the connecting network between arteries and veins?

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Capillaries form the connecting network between arteries and veins. They are the tiniest vessels arranged in capillary beds that link arterioles (the small arteries) to venules (the small veins). Their walls are extremely thin, allowing oxygen and nutrients to diffuse from blood into tissues and waste products to diffuse back into the blood for removal. This exchange is the main function of the microcirculation. Arterioles feed blood into the capillary beds, while venules drain blood from them into larger veins. Lymphatics belong to the lymphatic system and carry lymph, not blood, so they don’t form the connecting network between arteries and veins.