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National Cancer Institute at the National Institutes of Health
Seer Training Modules: Introduction to the Muscular System
Self-guided learning activity where students learn about the structure and function of the human muscular system. There is a short quiz at the end of the lesson to check for understanding.
CK-12 Foundation
Ck 12: Biology: Muscular System Study Guide
Review the structure and function of the human body's muscular system.
Curated OER
Kids Health: Bones, Muscles, and Joints
This article from Family Doctor.org provides in depth terminology and helpful diagrams. This site has links to related articles to learn more about the musculoskeletal system.