The skeletal system is your body’s framework. It supports you, protects organs, helps you move, stores minerals, and makes blood cells. There are 206 bones in the adult human body. We’ll break this into simple, powerful chunks: 1️⃣ Functions of the Skeletal System You need to know these cold: Support – Keeps your body upright. Protection – Shields vital organs. Movement – Works with muscles. Mineral storage – Stores calcium & phosphorus. Blood cell production – Happens in bone marrow. Example: Skull → protects brain Rib cage → protects heart & lungs Femur → supports body weight 2️⃣ Two Main Divisions 🧠 Axial Skeleton (80 bones) This is the center line of your body. Includes: Skull Vertebral column Rib cage Think: head + spine + ribs 💪 Appendicular Skeleton (126 bones) This is the limbs and attachments. Includes: Arms Legs Shoulder girdle Pelvic girdle Examples: Femur (longest bone) Humerus Pelvis Think: movement bones 3️⃣ Types of Bones You don’t just memorize names — understand categories. Long bones – femur, humerus Short bones – wrist bones Flat bones – skull, ribs Irregular bones – vertebrae Sesamoid bones – Patella 4️⃣ Joints (Where Bones Meet) Types: Immovable – skull sutures Slightly movable – between vertebrae Freely movable (synovial) – shoulder, knee Example: Knee = hinge joint Shoulder = ball-and-socket joint Quick Memory Strategy Instead of rereading: Cover the page. Write down: 5 functions 2 divisions 5 bone types