What is the role of capillaries in the circulatory system?

The role of capillaries in the circulatory system is to connect arteries to veins, facilitating gas exchange. Capillaries are the smallest blood vessels and are crucial for the exchange of oxygen, carbon dioxide, nutrients, and waste products between the blood and the tissues. Their thin walls allow for the diffusion of gases and other substances directly into and out of the cells, ensuring that tissues receive the oxygen they need while removing carbon dioxide and other metabolic wastes.

This connection between arteries and veins creates a network that ensures efficient blood flow and nutrient delivery throughout the body. Through this process, capillaries play a vital role in maintaining homeostasis and supporting the body's overall function.