What is wearing and tearing of bones ? GCSE Biology Watch

JacobBob
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I read this on bbc bitesize
"In synovial joints, the ends of the bones are covered with cartilage (called articular cartilage) which cushions the joint and prevents friction and wear and tear between the bone ends."
What is meant by wear and tear of bones here, and how does cartilage prevent that ?
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sammyj97
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The end of bones are covered by cartilage. So when two bones in the body meet they don’t rub against each other and cause pain or wear down. The cartilage acts like a cushion between the two bones. Example the humerus with the radius/ulna.

People with arthritis have worn away their cartilage which is what causes pain.

Hope that helps
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Last edited by sammyj97; 1 month ago
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Jpw1097
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(Original post by JacobBob)
I read this on bbc bitesize
"In synovial joints, the ends of the bones are covered with cartilage (called articular cartilage) which cushions the joint and prevents friction and wear and tear between the bone ends."
What is meant by wear and tear of bones here, and how does cartilage prevent that ?
Articular cartilage is very smooth and allows bones to move against each other without damaging the underlying bone. Without it, bones would rub against each other, causing pain and damage to the bone. In fact, this is what happens in osteoarthritis, the articular cartilage is worn away and the bones begin to rub against each other causing pain and bony erosions, osteophytes (bony outgrowths).
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