Exercise produces coordinated physiological responses across skeletal muscle, metabolism, cardiovascular function, and multiple organs and tissues.

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Hawley and colleagues review exercise as a challenge to whole-body homeostasis that provokes integrated responses across cells, tissues, and organs in response to the metabolic and oxygen demands of contracting muscle.

This does not mean every form or dose of exercise produces the same adaptation, or that exercise can substitute for movement throughout the rest of the day.

This record supports the whole-body physiology beneath the chapter’s distinction between ordinary movement and concentrated exercise.

Broad, mature principles of human biology, behavior, or regulation supported across a substantial body of research.

Sources are listed according to the role they play in this claim. One source may provide direct support, another may explain a mechanism, establish a limitation, or prevent an interpretation from becoming broader than the evidence allows.

The printed book preserves the claim inside the argument that gives it meaning. These references connect the current digital record to the first-edition evidence trail.

This claim connects to the following parts of the Human OS architecture. The module labels locate the claim inside the framework; they do not imply that the research source validates the architecture itself.