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Sharon is a long-distance runner. After a certain point in her workout, she begins to feel a natural "high" instead of pain. This feeling is likely the result of chemicals in her brain called
Q24: Thomas has five questions to ask his
Q63: Examples of positive _ messages for the
Q74: Besides the neuron, the other main type
Q81: After a neuron fires, about how long
Q89: Most employers contact job applicants by e-mail
Q106: The brain and the spinal cord make
Q110: According to the activation-synthesis hypothesis of dreaming,
Q118: Scientists consider the _ to be the
Q124: Regarding premenstrual syndrome (PMS), which of the
Q132: Humans can hear frequencies between about _