The document discusses the nervous and endocrine systems and their roles in exercise. The nervous system has two main parts - the central nervous system consisting of the brain and spinal cord, and the peripheral nervous system which communicates with the CNS. Regular activity can enhance connections between nerves and muscles and improve strength over time. The endocrine system includes glands like the pancreas and adrenals that release hormones like insulin, adrenaline, and testosterone to prepare and support the body during exercise.

1. Lloyd Dean The Nervous and Endocrine System

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19. Etherton, (2006)