Certified Electronic Health Records Specialist (CEHRS) Practice Exam

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What is the primary function of the respiratory system?

Delivers nutrients to cells
Produces hormones
Distributes heat throughout the body
Delivers oxygen to cells

The correct answer is: Delivers oxygen to cells

The primary function of the respiratory system is to deliver oxygen to cells. This process is vital for the survival of cells, as oxygen is necessary for cellular respiration — the process by which cells convert nutrients into energy. The respiratory system facilitates this by allowing oxygen to enter the lungs when we breathe in, where it then diffuses into the bloodstream. The blood transports the oxygen to various tissues and cells throughout the body, supporting metabolic processes. In contrast, the other functions listed are carried out by different systems in the body. For instance, delivering nutrients to cells is primarily the function of the digestive and circulatory systems, which break down food and then transport essential nutrients. Producing hormones is the function of the endocrine system, responsible for regulating various processes in the body through hormone release. Distributing heat throughout the body relates more to the circulatory system, which helps maintain body temperature by circulating warm blood. Thus, the delivery of oxygen is distinctly the role of the respiratory system.