What is the main role of the circulatory system?

The main role of the circulatory system is to carry blood and nutrients throughout the body. This system comprises the heart, blood vessels, and blood, working in conjunction to deliver essential substances such as oxygen and nutrients to cells while facilitating the removal of waste products like carbon dioxide. This critical function supports the overall metabolism of the body, contributing to the health and efficiency of bodily systems.

While the other choices highlight important bodily functions, they do not aptly describe the primary responsibility of the circulatory system. For example, digestion is primarily a function of the digestive system, body temperature regulation is largely managed by the integumentary system, and waste elimination through the skin is not the principal role of the circulatory system. Understanding the distinct functions of body systems helps clarify the specific duties delegated to each.