What is the primary function of the heart?

The primary function of the heart is to pump blood throughout the body. This essential role ensures that oxygen-rich blood is delivered to tissues and organs, supporting cellular function and overall metabolism. The heart works continuously, rhythmically contracting to circulate blood through a network of arteries, veins, and capillaries, which is crucial for maintaining homeostasis and meeting the physiological demands of the body.

The other options reflect different functions that are not performed by the heart. For instance, filtering blood is primarily the function of the kidneys, movement is facilitated by muscles and the skeletal system, and energy storage is typically managed by various tissues, such as adipose (fat) tissue. Understanding the specific role of the heart helps clarify its importance in the circulatory system and overall health.