Which system is responsible for circulating blood throughout the body?

The circulatory system is responsible for moving blood throughout the body, delivering vital substances such as oxygen and nutrients to tissues and organs while also removing waste products like carbon dioxide. This system is composed of the heart, blood vessels, and blood. The heart acts as a pump, propelling blood through a vast network of arteries, veins, and capillaries, ensuring efficient transport and exchange of materials between the bloodstream and cells.

Other systems listed, such as the immune system, primarily focus on protecting the body from pathogens, while the respiratory system is involved in gas exchange rather than blood circulation. The endocrine system regulates bodily functions through hormones, which involves communication and coordination but does not circulate blood. Understanding the distinct roles of these systems highlights how crucial the circulatory system is for sustaining life by maintaining physiological balance through proper blood flow.