American Academy of Professional Coders (AAPC) Practice Exam

Which of the following is NOT a category of the human body?

1. Cells

2. Cells and Tissues

3. Organs

4. Atmospheres

The correct answer is: Atmospheres

The concept of human body categories typically includes levels of biological organization that comprise the structure and function of living organisms. These categories include cells, which are the basic unit of life; tissues, which are groups of similar cells performing a specific function; and organs, which are made up of tissues working together for a common purpose. In contrast, "atmospheres" refer to layers of gases surrounding a planet, or can be a term related to environmental science or meteorology, rather than a category applicable to the biological organization of the human body. Therefore, it does not fit within the established hierarchy of biological categories that describe human anatomy and physiology. Understanding these levels is crucial for fields such as medicine, biology, and anatomy, as they provide insights into how various systems work together within the human body.