Three groups of drugs are used to reduce the stickiness of platelets, thus preventing platelets from clumping together to form platelet plugs. The anti-platelet drugs are most effective in preventing abnormal blood clots from forming in arteries (as opposed to veins). Aspirin and dipyridamoleâ (Aggrenox).
In order to react, colliding molecules must have a total kinetic energy equal to or greater than some minimum value [Figure 14.13(b)]. The minimum energy required to initiate a chemical reaction is called the activation energy, Ea. The value of Ea varies from reaction to reaction.
Best Answer: All chemical reactions require some amount of energy to get them started. This energy is called activation energy. The way enzymes operate is by effectively lowering the amount of activation energy required for a chemical reaction to start. There are a number of mechanisms by which this activation energy decrease may be achieved.