Study Guide: Overview of performance physiology 1. What is the smallest living unit in the body? Cells 2. What is the meaning of organ systems? Describe and example. When organs work together to perform a specific function they are referred to as organ systems. For example, the brain and all the nerves emerging from it is called the central nervous system and plays an important role regulating the heart, blood vessels, lungs and the many other body organs. 3. What are the similarities between the human body and a machine? Both convert one form of energy into another to perform work. Both the human body and machine require constant maintenance to work efficiently. Like a machine, physical and efficient use of fuel by the athlete determines performance. 4. What is the purpose of training? Training stimulates the growth of the biological infrastructure so that ATP can be produced quickly and efficiently, delivered quickly to the organ systems needing it, and waste products removed so that there is minimal interference with the athletic
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