The principles of physiology are universal. Information learned on animals and plants cells can be applied to both groups. (Wikipedia, 2008)
It was because of Aristotles critical thinking and his emphasis on the relationship between structure and function that lead to the beginning of physiology. Following the start of physiology a man named Galen began experimenting with the human body and probing it. He was the first person to conduct physiology experiment. The Renissance Era prompted an increase in the interest of the physiology of the human body. As a result the study of human of anatomy and physiology became really popular. The father of physiology Herman Boerhaave became known in the 17th century. This was because of his writings in Leiden and textbook 'Institutiones medicae'. (Wikipedia, 2008) In the 19th century a Cell Theory made the knowledge of physiology rapidly grow. The theory that was proposed by Matthais Schledian and Theodor Schwann stated that all organisms are made up units called cells. Claude Bernard also added a few other experiments to the discovery of the units called cells, he then came up the concept of interieur. That concepts was later adapted the ideas into 'Homeostasis' by the physiologist Walter Cannon, (Wikipedia, 2008)

References
http://en.wikipedia.org/wiki/Physiology