Final answer:
A capillary network connects arterioles to venules, facilitating the exchange of substances between blood and body cells.
Step-by-step explanation:
A capillary network directly connects arterioles to venules. This network consists of capillary beds that provide a large surface area for the exchange of oxygen, nutrients, and wastes between the blood and body tissues. As blood flows through the circulatory system, it is transported away from the heart through arteries which branch into arterioles. Arterioles lead to the capillaries, which are the smallest blood vessels. These capillaries form a network that allows for efficient material exchange with surrounding tissue before converging into venules, which in turn flow into larger veins to carry blood back to the heart.