Nurse Aide Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The primary function of the heart in the body is circulation. The heart is a muscular organ that pumps blood throughout the body, delivering oxygen and nutrients to tissues and organs while also removing carbon dioxide and other wastes. This continuous flow of blood is essential for maintaining the health and function of all body systems.

While options like digestion, respiration, and excretion are vital processes in the body, they are not the primary roles of the heart. Digestion involves breaking down food and absorbing nutrients, respiration pertains to the exchange of oxygen and carbon dioxide in the lungs, and excretion is related to the elimination of waste products from the body. Each of these functions relies on the circulatory system and the heart to transport necessary substances, but they are distinct processes that occur in different organs. Thus, the correct answer highlights the heart's essential role in supporting overall body function through the circulation of blood.