Articulations

Scapula and humerus 

raising of the shoulder with arm going up (abduction)

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Humerus and ulna

moving forearm up and down keeping brachial area still (flexion)

Humerus and radius

keeping everything firm while moving wrists (supination)

Coxa and femur

foot widening outward (external rotation) 

Femur and tibia

extending bottom leg (extension)