noradrenaline: a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
agent: an active and efficient cause; capable of producing a certain effect
musical chairs: a child's game in which players march to music around a group of chairs that contains one chair less than the number of players; when the music abruptly stops the players scramble to sit and the player who does not find a chair is eliminated; then a chair is removed and the march resumes until only the winner is seated