Physiology restores purpose to evolutionary biology

Life is purposefully creative in a continuous process of maintaining integrity; it adapts to counteract change. This is an ongoing, iterative process. Its actions are essentially directed to this purpose. Life exists to exist. Physiology is the study of purposeful living function. Function necessarily implies purpose. This was accepted all the way from William Harvey in the 17th century, who identified the purpose of the heart to pump blood and so feed the organs and tissues of the body, through many 19th and early 20th century examples. But late 20th century physiology was obliged to hide these ideas in shame. Teleology became the ‘lady who no physiologist could do without, but who could not be acknowledged in public.’ This emasculation of the discipline accelerated once the Central Dogma of molecular biology was formulated, and once physiology had become sidelined as concerned only with the disposable vehicle of evolution. This development has to be reversed. Even on the practical criterion of relevance to health care, gene-centrism has been a disaster, since prediction from elements to the whole system only rarely succeeds, whereas identifying whole system functions invariably makes testable predictions at an elemental level.