Final answer:
The latissimus dorsi muscle contracts when the hand is placed in the back pocket of jeans.
Explanation:
Latissimus dorsi is the muscle that contracts when you put your hand in the back pocket of jeans. This muscle is located on the back and plays a significant role in shoulder and arm movements.
When the hand is placed in the back pocket, the action involves the use of the latissimus dorsi to some extent due to the position and movement required. It is one of the largest muscles in the upper body.
Understanding the anatomy and function of muscles like the latissimus dorsi can help in comprehending how different muscles interact and work together for various movements.
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