Which bone classification refers to bones like the femur and humerus?

The classification of bones into categories such as long, short, flat, and irregular is based on their shape and specific anatomical features. Long bones, such as the femur in the thigh and the humerus in the upper arm, are characterized by being longer than they are wide. These bones have a tubular structure, typically featuring a central cavity known as the medullary cavity, which contains bone marrow.

Long bones are primarily involved in supporting the weight of the body and facilitating movement. They also serve as levers to which muscles attach, enabling the body to perform a range of movements. Additionally, long bones play a crucial role in the production of blood cells within the bone marrow and the storage of minerals.

In contrast, short bones are roughly cubical in shape and provide stability and support with little movement, while flat bones serve protective functions, such as the skull protecting the brain. Irregular bones have varied shapes that do not conform to the other classifications, providing both support and flexibility. Therefore, the classification of femur and humerus as long bones is accurate, based on their structural characteristics and functions within the skeletal system.