What is formed and continues to contract?

Muscle tissue is formed from specialized cells that contract to facilitate movement. When stimulated, muscle fibers shorten, leading to contraction, which is essential for various bodily functions such as locomotion, circulation, and digestion. This process is crucial in both voluntary muscles, like skeletal muscles, and involuntary muscles, like cardiac and smooth muscles. The continuous contraction and relaxation of these muscles enable the body to perform a wide range of activities.