The primary role of the ribcage in humans is to protect vital organs, particularly the heart and lungs, from trauma and injury. The ribcage is composed of rib bones, the sternum, and thoracic vertebrae, creating a sturdy and flexible structure. It also plays a crucial role in respiration by facilitating lung expansion during inhalation and contraction during exhalation. The movement of the ribcage aids in the mechanics of breathing, allowing for efficient gas exchange. Additionally, the ribcage serves as an attachment point for muscles involved in breathing and upper body movement, contributing to overall stability and function.