The muscles: muscle Source The muscles: Apparato locomotore ID https://www.britannica.com/science/human-muscle-system https://www.britannica.com/science/human-muscle-system Encyclopædia Britannica https://www.britannica.com/science/human-muscle-system Source The muscles: Apparato locomotore Source https://www.britannica.com/science/human-muscle-system Source Source https://www.britannica.com/science/human-muscle-system Source The Muscular System The muscles: https://www.britannica.com/science/human-muscle-system https://www.britannica.com/science/human-muscle-system https://www.britannica.com/science/human-muscle-system Source https://www.britannica.com/science/human-muscle-system Source Source