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Muscular System

Across
A by-product of chemical reactions during physical activity
Straightens elbows
Longest muscle in the body
Calf muscle
Straightens knee
Decreases the angle between two bones
Flexes trunk (sit up)
Only place you'll find cardiac muscle
Stationary attachment
Down
Only type of voluntary muscle
No control over these muscles
Opposing muscles
These muscles hep in respiration
Front of the upper arm
Back of the thigh
Surrounds the shoulder joint