What does the term "muscular system" encompass?

The term "muscular system" encompasses skeletal muscles and their associated structures, which include tendons and fascia. Skeletal muscles are involved in voluntary movements and are attached to bones, allowing for locomotion and various body movements. This system is crucial for posture, balance, and the overall movement of the body.

The other types of muscles, such as cardiac and smooth muscles, play vital roles in different systems of the body. Cardiac muscle, found only in the heart, is responsible for pumping blood and is involuntary, meaning it operates without conscious control. Smooth muscle also operates involuntarily and is found in various organs, such as the intestines and blood vessels, aiding in processes like digestion and regulating blood flow.

While options discussing cardiac and smooth muscles acknowledge important muscle functions, the combination of skeletal muscles and their direct interactions with the skeletal system defines the muscular system specifically in terms of human anatomy and physiology. Therefore, the focus on skeletal muscles and their structures is what correctly describes the muscular system in the context of this question.