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ANS
Autonomic Nervous System
| Term | Definition |
|---|---|
| Sympathetic division | Branch of the ANS responsible for the fight-or-flight response; redirects resources of the body to prepare to fight the threat or run away |
| Sympathetic division pupil size | Diameter of the pupils increase to capture more light; enhances vision and allows one to see a wider range of environmental stimuli |
| Sympathetic division heart rate | Heart rate increases to improve circulation, getting more resources to parts of the body faster |
| Sympathetic division breath rate | Rate of breathing increases to improve oxygen collection, getting more oxygen to the body |
| Sympathetic division diameter of airways | Diameter of airways increases to improve oxygen collection and allow more carbon dioxide to escape |
| Sympathetic division blood pressure | Blood pressure increases to better push more blood due to the constriction of some blood vessels and dilation of others, blood flow is diverted away from certain organs and directed to certain organs. |
| Sympathetic division digestive secretions | Decreases to conserve energy; there is no need to digest food during an emergency |
| Sympathetic division digestive motility | Decreases to conserve energy; the muscles in the intestines stop and slow down to redirect energy and resources to the skeletal muscles of the body |
| Sympathetic division urinary bladder sphincter | Closes and constricts. Urination inhibits the ability to escape or fight a threat, though the sphincter will relax during situations of extreme fear |
| Sympathetic division saliva secretions | Decreases, for the same reason as digestive secretions |
| Sympathetic division sweat secretions | Increases to cool the body down due to activity of the muscles |
| Sympathetic division sexual functions | Orgasm and ejaculation are outcomes of the sympathetic response |
| Parasympathetic division | Branch of the ANS responsible for digesting meals and resting the body and calming it down. Directs energy to general maintenance of the body rather than using it to escape a threat. |
| Parasympathetic division pupil size | Decreases. There is no need to enhance the ability to detect environmental stimuli when an individual is not currently in danger |
| Parasympathetic division heart rate | Decreases. There is no need to deliver nutrients to cells quickly when an individual is idling. |
| Parasympathetic division breath rate | Decreases. There is no need to collect oxygen quickly when an individual is idling. |
| Parasympathetic division diameter of airways | Decreases. There is no need to enhance the exchange of gasses when an individual is idling. |
| Parasympathetic division blood pressure | Decreases. As the body is relaxed, there is no need to prepare the muscles to move. |
| Parasympathetic division digestive secretions | Increases. As there is no threat or immediate danger, the body now has the time necessary to break down nutrients. |
| Parasympathetic division digestive motility | Increases. Energy is now directed to the smooth muscles of the GI tract to help with food breakdown |
| Parasympathetic division urinary bladder sphincter | Relaxes to allow for free urination. |
| Parasympathetic division saliva secretions | Increases, for the same reason as why digestive secretions increase |
| Parasympathetic division sweat secretions | Decreases. As the body is not moving, less heat is being generated by the body, reducing the need to cool it off |
| Parasympathetic division sexual functions | Arousal is stimulated by parasympathetic neurons; it is difficult to become aroused when under stress |
Created by:
Rylyn27463
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