Guide 01 / six systems
Skeletal system
The body’s living framework: bone, cartilage, joints, and the connective tissue that lets structure become motion.
The job
Supports the body, protects vital organs, stores minerals, and gives muscles a rigid place to pull against.
Orient yourself
Begin at the axial skeleton, the central axis made of skull, vertebral column, and thoracic cage. From there, move outward into the appendicular skeleton: the limb bones and the girdles that attach them to the trunk.
Trace a pathway
A useful first route is skull to spine to rib cage to pelvis. Those four regions show how bones protect the brain, carry the body’s load, shelter the heart and lungs, and transfer force into the legs.
Make the connection
- Bone and muscle meet at joints to turn contraction into movement.
- The vertebral column protects the spinal cord while still allowing controlled motion.
- Bone marrow inside many bones produces blood cells, linking the skeleton to circulation.
Close the page
Can you explain it without looking?
Active recall turns recognition into understanding. Answer these prompts in your own words, then return to the guide only for the part you could not reconstruct.
Which parts form the axial skeleton?
Why is the pelvis both a ring and a load-bearing structure?
Where would you expect a joint to trade stability for range of motion?