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How do physiologists use experiments to study living organisms?
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Physiology
Adenosine triphosphate (ATP) is the power source of many biochemical reactions. It is produced in the cell structures and system listed at the left to energize the important life processes listed on the right. An abbreviated chemical formula of the structure of ATP is also shown. The two high-energy P―O―P bonds are responsible for its power.
Physiologists study living organisms by employing a combination of chemical, physical, and anatomical methods to understand how biological systems function. Modern experimental physiology, which began with William Harvey’s work on blood circulation, relies on testing hypotheses through controlled experimentation.12
Key approaches include:
- Analytical and Integrative Methods: Researchers investigate functional problems at the molecular and cellular levels while simultaneously working to integrate these findings into the complex, multi-faceted functions of the total organism.12
- Quantitative Measurements: Physiologists use sophisticated instrumentation to measure physiological phenomena. For example, the kymograph was historically used to record muscular motion and blood pressure.1
- Balance Experiments: Scientists analyze substances entering an organism (such as food and oxygen) and those leaving (such as waste products) to determine metabolic capacities.3
- Comparative Physiology: By studying various animals—such as using the large nerves of squids to understand nerve impulse transmission—physiologists gain insights into biological principles that apply across different species.2
- Laboratory Manipulation: Researchers often isolate tissues or disrupt cellular structures to study specific enzymes and chemical processes in a controlled environment.3