01 / Location & anatomical relationships
Throughout your body: around the skeleton, in organs and in the heart.
02 / Structure & organization
Skeletal muscle contains striated fibers under somatic motor control. Cardiac muscle is striated with specialized cell connections, while smooth muscle lacks visible striations. All use interactions between contractile proteins to generate force.
03 / Function
They move your body, pump blood and push food through your digestive tract.
04 / Mechanism
Muscle cells shorten when their internal proteins slide past one another. Skeletal muscles pull on bones, smooth muscles move materials inside organs, and cardiac muscle pumps blood. These muscle types differ in how they are controlled.
Working together: muscular system
When you bend your elbow, some muscles contract while others relax. Their coordinated pull moves the bones at the joint.
Meet this body system →FOR DEEPER STUDY
Connect structure with function
Contraction does not always shorten a whole muscle: force can develop while length stays similar or while the muscle lengthens under load. Tissue type determines control and organization.
Check your understanding
Locate the muscle in relation to its neighbors. Explain how the structural features described above support its function, then distinguish it from a nearby structure with a different role.
Keep learning
Continue with OpenStax Anatomy and Physiology for system-level study. This atlas is educational and has not undergone independent medical peer review.