What is the main purpose of the circulatory system?

The primary purpose of the circulatory system is to deliver oxygen and nutrients to tissues throughout the body. This system is fundamental to maintaining life, as all cells require oxygen for cellular respiration, a process that generates energy. Nutrients obtained from food are also transported via the blood to cells, where they are used for various metabolic processes.

The circulatory system, comprising the heart, blood vessels, and blood, works continuously to ensure that oxygen-rich blood reaches all parts of the body and that carbon dioxide and other metabolic waste products are collected and transported to excretory organs for removal. While supporting digestion, assisting in waste elimination, and regulating body temperature are important functions of the circulatory system, they serve more as secondary roles while the primary focus remains on the delivery of oxygen and nutrients to sustain cellular functions and overall health.