Anger a much talked about human emotion. If it is bottled up then it can consume our love, rationality and emotional and physical health. if we direct the heat of anger towards others, it destroys everything in the path-- friendships, work relationship, marriage and family.
 Physiologically anger includes two stage jolt. First stage is the surge of Adrenaline which lasts for few minutes but energizes the body for immediate action. (fight or Flight)
 Second surge of Catecholamines lasts longer, from few hours to days. This is what can be used by sports persons, mountaineers, divers, defence persons to convert their actions into great success. So long as we control the anger we feel and don't let it control us.