THE SYMPATHOMEDULLARY PATHWAY
- Immediate stressors arouse the autonomic nervous system - it governs itself.
- Some bodily responses may not work as well as they need to if you had to think about them.
- ANS divided into the sympathetic branch and the parasympathetic branch.
- SNS arouses someone to be ready for fight or flight, parasympathetic branch returns the animal to a state of relaxation.
- When exposed to a stressor, the SNS is activated, preparing the body for fight or flight.
- SNS and SAM system make up the SYMPATHOMEDULLARY PATHWAY.
- The SNS
- Neurones from the SNS travel to every organ and gland, preparing the body for fight or flight.
- Responses include an increase in heart rate, blood pressure and increased pupil size and metabolic changes such as the mobilisation of fat and glycogen.
- Noradrenaline is the NEUROTRANSMITTER released by SNS to activate these internal body organs.
- The SAM system
- When the SNS is activated, the SAM alerts the animal through the release of adrenaline into bloodstream where it is transported rapidly…