Scientists became interested in the workings of the human body during the "scientific revolution" of the 15th and 16th centuries. These early studies led to descriptions of the circulatory, digestive,...Scientists became interested in the workings of the human body during the "scientific revolution" of the 15th and 16th centuries. These early studies led to descriptions of the circulatory, digestive, respiratory, nervous, and excretory systems. In time, scientists came to think of the body as a kind of machine that uses a series of chemical reactions to convert food into energy.
