WORDS TO UNDERSTAND aerobic— relating to activity that increases the body’s demand for oxygen thereby resulting in a marked temporary increase in respiration and heart rate anaerobic— relating to activity in which the body incurs an oxygen debt cognitive— relating to or involving conscious intellectual activity (such as thinking, reasoning, or remembering) endorphins— any of a group of peptides occurring in the brain and other tissues of vertebrates, and resembling opiates, that react with the brain’s opiate receptors to raise the pain threshold hippocampus— the elongated ridges on the floor of each lateral ventricle of the brain, thought to be the center of emotion, memory, and the autonomic nervous system


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