托福阅读经典练习 Hormones in the Body.docx
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托福阅读经典练习 Hormones in the Body
托福 阅读题高分秘诀除了积累一定的词汇和句型，提高 托福阅读 速度，在备考过程中搜集一定量的托福阅读练习材料，掌握托福阅读答题方法和思维方式，也是非常重要的，下面，小编为大家推荐一篇托福阅读练习材料：Hormones in the Body，并附答案。
Up to the beginning of the twentieth century, the nervous system was thought to control all communication within the body and the resulting integration of behavior. Scientists had determined that nerves ran, essentially, on electrical impulses. These impulses were thought to be the engine for thought, emotion, movement, and internal processes such as digestion. However, experiments by William Bayliss and Ernest Starling on the chemical secretin, which is produced in the small intestine when food enters the stomach, eventually challenged that view. From the small intestine, secretin travels through the bloodstream to the pancreas. There, it stimulates the release of digestive chemicals. In this fashion, the intestinal cells that produce secretin ultimately regulate the production of different chemicals in a different organ, the pancreas.
Such a coordination of processes had been thought to require control by the nervous system; Bayliss and Starling showed that it could occur through chemicals alone. This discovery spurred Starling to coin the term hormone to refer to secret