What is the primary function of the appendicular skeleton in vertebrates?

The appendicular skeleton primarily functions to support the appendages, which include the limbs and their associated girdles (the pelvis and shoulder girdles). This structural framework is essential for movement, allowing for a wide range of motions in various vertebrates, from walking and running to flying and swimming. The bones of the appendicular skeleton provide attachment points for muscles, facilitating locomotion and enabling the organism to interact with its environment effectively.

While the other functions listed are important, such as protection of vital organs which is primarily the role of the axial skeleton, and production of blood cells which occurs mostly in the bone marrow of various bones, the primary focus of the appendicular skeleton is indeed its role in supporting the limbs. Additionally, mineral storage, particularly of calcium and phosphorus, occurs in many bones throughout the body but is not the primary function of the appendicular skeleton.