Neblux Knowledge Graph
Physiology
Physiology is the scientific study of the normal functions and mechanisms that operate within living organisms, from cells and organs to whole systems.
Overview
Physiology emerged as a rigorous experimental discipline in the 17th century when William Harvey demonstrated the circulation of blood. By the 19th century, Claude Bernard's introduction of the concept of the internal environment transformed the field, showing that organisms actively regulate their internal conditions — a principle later formalized as homeostasis by Walter Cannon. Modern physiology spans multiple levels of biological organisation: cellular physiology examines membrane potentials and signal transduction, while systems physiology studies how the cardiovascular, respiratory, renal, and nervous systems coordinate to maintain function. The discipline relies heavily on chemistry and physics to explain the fundamental processes that keep organisms alive.
Why it matters
Physiology is essential to medicine: knowledge of normal physiological states defines the baseline from which pathology is identified, and physiological measurements — blood pressure, heart rate, blood glucose — are central to clinical diagnosis. Discoveries in physiology have enabled critical medical breakthroughs, including understanding of insulin regulation in diabetes, lung mechanics in respiratory medicine, and cardiac electrophysiology in the treatment of arrhythmias. Physiological principles also influenced engineering, leading to biomedical devices such as cardiac pacemakers, mechanical ventilators, and artificial kidneys. Sports science and high-performance training also depend on physiological understanding of energy metabolism and muscle function.
What it builds on
Related concepts
- MedicineappliedUnderstanding normal physiological function is an essential prerequisite for diagnosing and treating disease in clinical medicine
- Cell BiologyconceptualPhysiological processes at the organ level emerge from molecular and cellular mechanisms studied in cell biology
- NeurosciencehistoricalNeurophysiology pioneered the experimental investigation of nerve and brain function, forming the empirical foundation of modern neuroscience
- ChemistryconceptualBiochemical physiology integrates chemical principles to explain enzymatic reactions, ion gradients, and metabolic pathways in living systems
- EngineeringappliedPhysiological principles of mechanical and electrical function in the body have directly inspired biomedical engineering devices such as pacemakers and prosthetics