Norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.
<h3>What is Norepinephrine?</h3>
Norepinephrine is a neurotransmitter (i.e., a chemical messenger) which is well known for sending information to the brain in order to increase alertness during some particular situation and also serve to constrict blood vessels.
In conclusion, norepinephrine is released from sympathetic nerves, causing the heart rate to increase to higher values.
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This model was called GENERAL ADAPTATION SYNDROME [GAS].
Hans Selye proposed the three stages model of GAS, the three stages are alarm, resistance and exhaustion. During the alarm stage, the sympathetic nervous system prepares the body for action. In the resistance stage, the sympathetic nervous system recruits resources that will be needed to maintain high level of activity and energy. In the exhaustion stage,the parasympathetic nervous system takes over and the body experiences physical illnesses.
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