A capillary network refers to the intricate system of tiny blood vessels called capillaries that connect arteries and veins throughout the body. These vessels are essential for the exchange of oxygen, nutrients, and waste products between the blood and surrounding tissues. Their thin walls allow for efficient diffusion, making them crucial for maintaining healthy cellular function. In addition to their role in the circulatory system, capillary networks are also found in other biological systems, such as the lymphatic system. This network helps transport lymph fluid, which is important for immune function and fluid balance in the body. Overall, capillary networks play a vital role in sustaining life by facilitating essential exchanges at the cellular level.