In response to a threatening stimulus, blood pressure increases, pupils dilate, and digestion stops. These responses reflect activation of the _____ nervous system.

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The sympathetic nervous system is responsible for the "fight or flight" response, which is triggered in response to a threat or stressor. This response includes increased blood pressure, dilated pupils, and decreased digestion, among other physiological changes. The somatic nervous system is responsible for conscious motor movements, while the parasympathetic nervous system is responsible for the "rest and digest" response. The central nervous system includes the brain and spinal cord.

In Response to a Threatening Stimulus, Blood Pressure Increases, Pupils