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, cells, biological compounds, and how they all interact to make life possible.

The study of physiology is, in a sense, the study of life. It asks questions about the internal workings of organisms and how they interact with the world around them.

Physiology tests how organs and systems within the body work, how they communicate, and how they combine their efforts to make conditions favorable for survival.

Human physiology, specifically, is often separated into subcategories; these topics cover a vast amount of information.

Most of physiology depends on basic research studies carried out in a laboratory. Some physiologists study single proteins or cells, while others might do research on how cells interact to form tissues, organs, and systems within the body.

While human anatomy is the study of the body’s structures, physiology is the study of how those structures work. An imaging scan like an X-ray or ultrasound can show your anatomy, but doctors use other tests -- like urine and blood tests or electrocardiograms (EKGs) -- to reveal details about your body’s physiology.

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