The ends of the femur are covered in a smooth, slippery substance called articular cartilage. This cartilage protects and cushions the bone when you bend and straighten your knee. The normal anatomy of the knee.
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It WILL make you healther with taking tabacco or any drugs or cigrattes your heart will stop working and your lungs and teeth will get black and you will sooner or later end up dying. so DONT DO DRUGS AND ANYTHING!
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