Final answer:
The system in question is the muscular system, which works in conjunction with the skeletal system to allow for body movement, maintain posture, and protect organs through muscle contraction and the movement of bones.
Step-by-step explanation:
The system that covers, shapes, and holds the skeletal system in place while allowing for body movement through contraction is the muscular system. The skeletal system and muscular system work together to support the body, enable a wide range of movements, and maintain posture. Skeletal muscles, attached to bones by tough connective tissues called tendons, contract and pull on the bones. This action enables activities like standing, walking, and running. Moreover, muscles help maintain balance, provide stability to joints, and protect internal organs by acting as a barrier against external trauma.
Muscles attach to joints, spanning across them and acting upon the skeletal levers to facilitate movement. The collaborative function of these two systems is often referred to as the musculoskeletal system. While skeletal muscles are responsible for movement, they also engage in constant adjustments to resist gravity and maintain posture, highlighting their role in both initiating and inhibiting motion depending on bodily demands.