Physiology

Physiology is the study of the life functions of plants and animals, both in the whole organism and at the cellular or molecular level, under normal and abnormal conditions. Physiologists often specialize in functions such as growth, reproduction, photosynthesis, respiration, or movement, or in the physiology of a certain area or system of the organism.

Biological systems

 * Main Article: Biological system

Processes

 * Main Article: Biological process