American Academy of Professional Coders (AAPC) Practice Exam

Which type of bone is specifically referred to as tubular?

1. Short

2. Flat

3. Long

4. Sesamoid

The correct answer is: Long

The term "tubular" specifically refers to the long bones in the human body. Long bones are characterized by their elongated shape, which resembles a tube or cylinder. This structure allows them to function effectively in facilitating movement and supporting weight, as they are found in areas such as the arms and legs. Long bones consist of a diaphysis (the shaft) and two epiphyses (the ends), providing a unique structural framework that is crucial for a range of motions and activities. They are also key in the production of blood cells due to their red marrow. In contrast, short bones are roughly cube-shaped and provide stability with little movement, flat bones serve primarily protective functions and are thin and curved, while sesamoid bones, such as the patella, are small, round bones that form within a tendon and help facilitate joint movement. Each of these bone types has distinct shapes and functions, but the term "tubular" specifically aligns with the classification of long bones.