What characterizes joints in the human body?

Joints in the human body are primarily characterized as the locations where two or more bones connect. This fundamental function of joints allows for varying degrees of movement and stability across different parts of the body. Joints can be classified into several types, such as synovial, hinge, and ball-and-socket joints, each allowing specific movements that are essential for daily activities and overall mobility.

While joints do play a role in providing stability and facilitating movement, they do not serve as attachment points for muscles, produce hormones, or directly protect internal organs. Instead, muscles attach to bones via tendons, and while some joints may contribute to the overall protection of organs by forming part of the skeletal structure, that is not their primary characteristic. The key aspect of joints remains their role in connecting bones, which is critical for the skeletal system's function.