You are helping an individual retrieve a very heavy box off of a high shelf. You have to fully flex your shoulder in order to get this box and then you will extend the shoulder back to anatomical position to place the box safely where it needs to be.  1. What are all the muscles responsible for the first movement of flexion to get the box? 2. What are all the muscles responsible for the second movement of extension to safely place the box where it needs to be?

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Human Movement

Humans can move from one place to another through coordinated movements and postures. The movement produced by the human body due to the contraction of muscles and bending of bone joints is called human movement. Human movements are controlled by the nervous system. Hence, the human movement incorporates the use of muscles, ligaments, joints, and bones.  Kinesiology is the field that deals with the study of human movements.