physiology

n. study of the functions and activity of the body

Physiology (from Greek: φυσις, physis, “nature, origin”; and λόγος, logos, "knowledge") is the study of the mechanical, physical, and biochemical functions of living organisms. Physiology has traditionally been divided between plant physiology and animal physiology but the principles of physiology are universal, no matter what particular organism is being studied. For example, what is learned about the physiology of yeast cells may also apply to human cells.The field of animal physiology extends the tools and methods of human physiology to non-human animal species. Plant physiology also borrows techniques from both fields. Its scope of subjects is at least as diverse as the tree of life itself. Due to this diversity of subjects, research in animal physiology tends to concentrate on understanding how physiological traits changed throughout the evolutionary history of animals. Other major branches of scientific study that have grown out of physiology research include biochemistry, biophysics, paleobiology, biomechanics, and pharmacology.
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Physiology /phys·i·ol·o·gy/ 1. the science which treats of the functions of the living organism and its parts, and of the physical and chemical [more]Physiology - Community and Resources

Noun
1. the branch of the biological sciences dealing with the functioning of organisms
(hypernym) biology, biological science
(hyponym) kinesiology
(class) abducent, abducting
2. processes and functions of an organism
(hypernym) bodily property

(n.)
The science which treats of the phenomena of living organisms; the study of the processes incidental to, and characteristic of, life.
  

(n.)
A treatise on physiology.