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.
A plant hormone that controls dormancy, and inhibits other hormones. absorption. The process in which soluble food molecules are diffused, and pass into the blood stream, usually in the small intestine. acid. A substance with a pH less than 7, that donates a hydrogen ion when dissolved in water. activation energy. The minimum amount of energy that is required to start a chemical reaction.