What are the main elements found in the circulatory system?

The main elements found in the circulatory system are the heart, blood, and blood vessels. The heart functions as the central pump that circulates blood throughout the body, delivering oxygen and nutrients while removing waste products. Blood serves as the transport medium, carrying essential substances to and from cells. Blood vessels, including arteries, veins, and capillaries, form the network through which blood flows, enabling the system to function efficiently.

This combination ensures that the circulatory system can maintain homeostasis, support metabolic processes, and sustain life by ensuring that every part of the body receives the necessary components for proper functioning. Other choices may contain related elements, but they do not encapsulate the primary components of the circulatory system as accurately as the correct answer.