Controls subconscious activities of muscles and glands
two main divisions:
1.) The sympathetic nervous system – Speeds up activities and thus allows us to cope with stressful situations (fight or flight response).
2.) The parasympathetic nervous system – Inhibits effects and slows down activities. This allows energy to be conserved. Controls under normal resting conditions.
The two divisions are antagonistic, meaning that their effects oppose one another.
Changes of the heart rate are controlled by a region of the brain called the medulla, which has two main divisions:
- One division is connected to the sino-atrial node through the sympathetic nervous system.
- The other is connected to the sino-atrial node via the parasympathetic nervous system.
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