1. Endergonic reactions require energy and include anabolic reactions and the contraction of muscle.2. A chemical reaction is endergonic when non spontaneous. 3. Metabolism is the total of all catabolic, exergonic, anabolic, endergonic reactions. 4. This is in contrast with an endergonic process. 5. Nevertheless, endergonic reactions are quite common in nature, especially in biochemistry and physiology. 6. The reverse reaction is exothermic but endergonic . 7. The normal condition I would bet, is that condensation is endergonic at equilibrium temperatures. 8. The reverse is endergonic but exothermic. 9. Examples of endergonic reactions in cells include protein synthesis, and the nerve conduction and muscle contraction. 10. The process of getting to the top of the activation energy barrier to the transition state is endergonic .