CNPR Practice Exam — Comprehensive Prep Guide & Practice Questions

In the human body, red blood cells outnumber white blood cells by a significant margin. In a healthy adult, it is estimated that there are about 600 to 700 red blood cells for each white blood cell. This substantial difference is due to the primary functions of these cells; red blood cells are responsible for transporting oxygen throughout the body, while white blood cells are part of the immune system, primarily involved in fighting infections and diseases.

While the number of white blood cells can fluctuate based on various factors such as health status or age, in general, for any given volume of blood, red blood cells will always be present in much greater quantities compared to white blood cells. The lymphatic system and bone marrow regulate the production of these cells, ensuring that the body maintains adequate levels of each type, but the fundamental ratio remains constant under normal circumstances. Therefore, the assertion that there are more white blood cells than red blood cells is indeed false.