Arthritis is the disease of

Select the correct statement regarding human locomotion.

Which of the following is an autoimmune disorder affecting the joints?

$A$: Inflammation of a skeletal joint may immobilize the movements of the joint.
$R$: Uric acid crystals in the joint cavity and ossification of articular cartilage lead to this.

Sprain is caused due to excessive pulling of

Provide information regarding disorders of the skeletal and muscular system.