Arthritis causes joints to be painful and stiff by
a. causing structural changes in cartilage of the joints
b. decreasing blood circulation
c. decreasing bone density
d. gradually hardening arteries
Ans: a. causing structural changes in the cartilage of the joints
(With arthritis cartilage that cushions the ends of bones in your joints gradually deteriorates. Arthritic changes happen in the bone and deterioration of the connective tissues that hold the joint together and attach muscle to bone. It also causes inflammation of the joint lining.)
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