Adiamond shaped muscle that stretches from the base of the neck to the middle of the back, and laterally to each scapula bone, to provide movement of the shoulders

This muscle is the Trapezius, a diamond (trapezoid) shaped muscle involved in shrugging (elevating) and retracting (pulling back) the shoulder.

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A  reaction  in which  energy  is  released  to the surroundings is called an exothermic  reaction. in this type of  reaction  the enthalpy, or stored  chemical energy, is lower for the products than the reactants. when ammonium nitrate is dissolved in water,  energyis  absorbed  and the water cools.