It must be aggressive enough to fight infections and cancer, yet restrained enough to avoid attacking the body's own tissues.

Animal physiology encompasses the coordinated functions of multiple organ systems that ensure survival, adaptation and homeostasis in diverse species. From the cardiovascular and respiratory systems ...

Physiology is the study of normal function within living creatures. It is a sub-section of biology, covering a range of topics that include organs, anatomy, and biological compounds, among others.