KP231 Chapter Notes - Chapter 1: Sympathetic Nervous System, Autonomic Nervous System, Mucous Membrane
21 Feb 2017
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Document Summary
Stress refers to situations that trigger physical and emotional reactions and the reactions. Stressor: situation or event that triggers the reactions. Stress response: the reactions triggered by stressors. Nervous system consists of brain, spinal cord, and nerves, part of it under voluntary control. Autonomic nervous system is not under conscious supervision (two divisions; parasympathetic and sympathetic) Sympathetic nerves use norepinephrine to exert their actions on the parts of our body that enable us to handle emergency. Commands your body to stop storing energy and use in response to crisis. System of glands, tissues, and cells help control body functions by releasing hormones and other chemical messengers into blood stream. These influence metabolism and other bodily processes. Chemical messengers and actions of sympathetic nervous system cause the release of cortisol and epinephrine. Heart rate and respiration rates increase to speed oxygen throughout the body. Liver releases extra sugar into bloodstream to boost energy. Brain releases endorphins (block sensations of pain)
