Sympathetic system

• Fight , flight or freeze response
• Occur when you are under stress 
• Looks like 

  • Increased heart rate 
  • Increase in air intake by lungs 
  • Pupils of eyes are dilated  (get larger) 
  • Inhibits (or slows down) digestion
• The fight, flight or freeze response is an evolutionary adaptation that enhances survivals 
• By preparing the body to respond swiftly to danger, this mechanism increases the chances of avoiding harm 
• When an individual perceives a threat, sensory information is sent to the brain
• The amygdala, the part of the brain involved in emotional processing, plays a crucial role in recognising danger and triggering the response
• • Amygdala sends a distress signal to the hypothalamus which activates the sympathetic nervous system. This leads to the release of adrenaline and noradrenaline from the adrenal glands 
• Fight response: 

  • The body prepares to confront and combat the threat. This response involves aggression and readiness to take action against the threat 
  • Physical signs: clenched fists, muscle tension, increased alertness and focus on the threat 
• Flight response: 

  • The body prepares to escape from the threat. This involves running away or otherwise removing oneself from the danger 
  • Physical signs: rapid movement, increased heart rate and a focus on finding an escape route 
• Freeze response: 

  • The body may become imobile, hoping that the threat will overlook it or pass by. This response can occur when the threat seems too overwhelming to confront or escape 
  • Physical signs: stiffness, holding breath, decreased movement and sometimes a sense of detachment or numbness 
• Short term effects 

  • In the short term, these physiological changes are beneficial and can help an individual respond effectively to a threat 
• Long term effects 

  • Chronic activation of this response due to ongoing stress can lead to health problems such as cardiovascular disease, digestive issues, weakened immune system, anxiety disorders and depression