What are capillaries known for?

Capillaries are primarily known for their role in connecting arterioles and venules, which is crucial for the circulation of blood throughout the body. They are the smallest blood vessels, and their primary function is to facilitate the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and surrounding tissues. This exchange occurs because capillaries have thin walls that make diffusion efficient. By linking the arterioles, which conduct blood away from the heart, to the venules, which return blood to the heart, capillaries play an essential role in the overall circulatory process. This connection ensures that all tissues receive adequate blood supply and that waste products are efficiently removed.