First Aid for Corrections Officers Practice Test 2026 – The All-in-One Resource to Master Your Exam Success!

The primary function of capillaries is to connect arteries to veins, facilitating the exchange of oxygen, nutrients, and waste products between the blood and tissues. Capillaries are the smallest blood vessels, and their walls are thin enough to allow for the diffusion of gases and other substances. This connection is essential for maintaining proper circulation and ensuring that tissues receive the necessary materials for cellular function while simultaneously removing waste products.

In the overall circulatory system, arteries carry oxygen-rich blood away from the heart, while veins return oxygen-depleted blood back to the heart. Capillaries serve as the intermediary vessels where this exchange occurs, which is crucial for sustaining life. Each capillary network serves specific tissues, ensuring that they receive an adequate blood supply while also playing a vital role in regulating local blood flow. Hence, their main role of connecting arteries to veins underscores their importance in the overall functioning of the vascular system.