What is physiology?

Physiology is the study of how the human body works. Describes the chemistry and physics behind basic body functions, from how molecules behave in cells to how organ systems work together. It helps us understand what happens in a healthy body in everyday life and what goes wrong when someone gets sick. Most of the genprice physiology depends on basic research studies carried out in a laboratory. Some physiologists study individual proteins or cells, while others might investigate how cells interact to form tissues, organs, and systems within the body.

Physiology vs Anatomy

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

What physiology tells us about the body

Physicians use physiology to learn more about many different organ systems, including:

  • The cardiovascular system: the heart and blood vessels
  • The digestive system: the stomach, intestines, and other organs that digest food.
  • The endocrine system: glands that produce hormones, the chemicals that control many body functions.
  • The immune system: your body’s defence against germs and disease
  • The muscular system: the muscles you use to move your body.
  • The nervous system: the brain, spinal cord, and nerves
  • The renal system: Your kidneys and other organs that control fluid in your body.
  • The reproductive system: sexual organs for men and women.
  • The respiratory system: your lungs and airways
  • The skeletal system: bones, joints, cartilage and connective tissue

For each system, physiology sheds light on the chemistry and physics of the structures involved. For example, physiologists have studied the electrical activity of the cells in the heart that control its beating. They are also exploring the process by which the eyes detect light, from how cells in the retina process light particles called photons to how the eyes send signals about images to the brain.

Physiology revolves around understanding how the human body maintains a stable state while adapting to external conditions, a process called homeostasis. How do your organ systems keep their temperature relatively stable in different environments? How does your body keep blood sugar and other chemical levels constant even when you eat different foods? These are the kinds of questions that physiologists aim to answer.

Physiology in Medicine

By shedding light on normal bodily functions, physiology can teach lessons about what goes wrong in disease. For example, physiologists have discovered how different types of cells in the pancreas release hormones to control blood sugar levels. That helps doctors understand and treat diabetes.

The field also offers information on how to make the human body work more efficiently. It is often part of sports medicine, where knowing how the body adapts to physical challenges helps elite athletes improve performance, avoid injury and recover faster.

History of physiology

Anatomy is visible, and ancient doctors and scientists studied it through dissections, surgeries, and observation. But how the body actually works is more difficult to explore. This means that physiology is a more modern science. Early explanations of how organs or functions in the human body might work were often guesswork, based on processes that were familiar to scientists.

For example, some thought that the formation of an embryo was similar to how milk turns into cheese. Other early scientists compared blood flow throughout the body to weather patterns. In the 17th century, microscopes helped shed new light on the cells that make up the human body, leading to a new understanding of physiology. More recently, tools such as gene sequencing technologies and new types of body scans have given physiologists an expanded view of the human body.

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