What is sprain ?

Excessive stretching of ligament or wrench or twist the ligaments ofthat causes pain and swelling but not dislocation is called sprain.
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What is appendicular skeleton?

The bones of the limbs alongwith their girdles form the appendicular skeleton. 
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What is muscular dystrophy ?

Muscular dystrophy is the progressive degradation of skeletal muscles mostly due to genetic disorder.
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Comment : Why red muscles are more efficient than white muscles ?

Red muscles contain plenty of mitochondria and undergo aerobic respiration. Since the red muscles have large number of mitochondria , they can provide more energy. The aerobic respiration prevents the formation of lactic acid and thus prevent muscular cramps. 
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What is the function of synovial fluid?


Synovial fluid lubricates and reduces friction between the joints.
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