Lesson 2 ·Class 9 · Skeleton — Movement and Locomotion · Sort Lab
Bone and Cartilage
What the skeleton is made of.
Sort each feature into the tissue it describes.
Sorted 0/10
All items sorted — check each bin.
VS
Free play — sort every item into the bin it belongs in; each correct drop tells you why. Switch to when you're ready to test yourself.
The blood supply explains a great deal: bone heals, cartilage barely does — which is why a torn knee cartilage is such a serious injury.
What this lesson covers
Challenges to clear
- Sort every feature.
- Fill the Cartilage column — the softer skeleton that never turns to bone.
The task
Sort each feature into the tissue it describes.
What this lesson covers
- Bone: Hard and rigid, cannot be bent (Its matrix is impregnated with calcium salts.); Matrix contains calcium phosphate and carbonate (The mineral is what gives the hardness.); Has its own blood vessels running through it (Which is why a broken bone can heal itself.); Contains marrow in a central cavity (Red marrow makes blood cells; yellow marrow stores fat.)
- Cartilage: Firm but flexible; can be bent slightly (Its matrix is chondrin, without calcium salts.); Matrix is a protein called chondrin (Softer, and it can be compressed slightly.); Has no blood vessels; fed by diffusion (Which is why damaged cartilage heals slowly, or not at all.); Found in the ear pinna, nose tip and windpipe rings (Places needing a shape held firmly but not rigidly.); Caps the ends of bones at a joint (It cushions the impact and gives a smooth gliding surface.); In the embryo the whole skeleton is made of it (It is gradually replaced by bone as the child grows — ossification.)
Hint
The blood supply explains a great deal: bone heals, cartilage barely does — which is why a torn knee cartilage is such a serious injury.