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Which muscle is responsible for knee flexion?

1. rectus femoris
2. semitendinosus
3. adductor longus

The supraspinatus muscle is an:

1. abductor of the scapula
2. adductor of the humerus
3. abductor of the humerus

The splenius capitus:

1. rotates the neck to the opposite side
2. rotates the head and neck to the same side
3. forward flexes the neck