Physiology is the study of the function and activities of living things and their parts.
There are several reasons to study physiology. For example, if you're planning on going into a health career, you need to have a good understanding of how the vertebrate body works. Such knowledge will help you apply physiological principles to the practice of your art, e.g. knowing when it's appropriate to use leeches. But even if you're not going into a health profession, understanding physiology is likely to assist you in most fields of biology. It should be understood, however, that this achievement represents only the first phase of the campaign.