What is the primary function of the heart?

The primary function of the heart is to pump a sufficient amount of blood to all cells in the body. This action is essential for delivering oxygen and nutrients to tissues and organs while also facilitating the removal of carbon dioxide and metabolic waste. The heart achieves this through its rhythmic contractions, which are controlled by electrical impulses, ensuring that blood circulates throughout the entire body efficiently.

While filtering blood impurities, producing hormones for blood pressure regulation, and regulating body temperature are important physiological processes in the body, they are not the primary functions of the heart itself. The heart's main role centers around circulation, making option B the correct choice in understanding the heart's vital purpose in maintaining overall health and homeostasis.