What is physiology based on?

Physiology is fundamentally concerned with the functions and processes of living systems, which involve how various parts of an organism work together. While the study of tissues, cells, and organisms is integral to physiological understanding, the organization of these functions is most effectively framed through the lens of organ systems. Each organ system serves specific roles vital to maintaining homeostasis and overall health.

For example, the cardiovascular system’s functioning, which includes the heart and blood vessels, is intricately involved in nutrient delivery and waste removal, highlighting its role as part of a larger integrated system rather than focusing exclusively on the individual components like tissues or cells. Understanding physiology at the organ system level allows for a more holistic view of how various body systems interact, contribute to the organism's overall function, and respond to challenges. Hence, the emphasis on organ systems provides a more comprehensive approach to studying the dynamics of living organisms.