1. False. Some joints are fixed, such as the joints between bones in your skull. But many joints are movable, like knees, wrists, ankles, and knuckles.
  2. True. Cartilage is a smooth, slippery substance that covers the ends of the bones in your joints. Healthy cartilage helps the joints move smoothly. When it wears away, the bones can grind against one another, causing pain and difficulty moving the joint.
  3. False. Children and young adults can get some forms of arthritis.
  4. True. Especially in older people, osteoarthritis is the most common form of arthritis. It is caused by the cartilage in a joint breaking down and wearing away.
  5. True. Rheumatoid arthritis is an autoimmune disease, in which the immune system attacks healthy tissues in the joints as if they were disease-causing germs.
  6. True. Children can develop almost all types of arthritis that affect adults, but the most common type seen in children is juvenile idiopathic arthritis.
  7. False. Your joints will usually heal from injuries, but the damage may lead to arthritis later in life. So it’s important to wear protective gear when you play sports and avoid injuring your joints.
  8. True. Extra weight can put more strain on your joints and can increase your risk for osteoarthritis later in life.
  9. False. You should get at least 60 minutes of exercise every day. It doesn’t have to be a whole hour all at once.
  10. D, all of the above.
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