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A-Level Biology OCR A

Blood Muscle Fight Flight Heart Increase List Physiological

Fight or flight response causes increased heart rate (more O2), dilated pupils (better vision), constricted skin arterioles (redirects blood), increased blood glucose (more energy), relaxed airways (more O2), shutdown of non-essential systems (like digestion), and difficulty focusing on small tasks.

Los cambios fisiológicos en la respuesta de 'lucha o huida' incluyen aumento de la frecuencia cardíaca (más O2), dilatación pupilar (mejor visión), constricción de arteriolas cutáneas (más sangre a músculos), aumento de glucosa sanguínea (más energía), relajación de vías aéreas (más O2), cese de sistemas no esenciales y dificultad para tareas menores (cerebro enfocado en la amenaza).

Front List 7 physiological changes that occur during the fight or flight response, describe the purpose of each.
Back Fight or flight effects:
  • Heart rate increase - pump more oxy blood around body
  • Pupils dilate - take in as much light as possible for better vision
  • Arterioles in skin constrict - more blood to major muscle groups, brain, heart and ventilation muscles
  • Blood glucose level increases - increase respiration to provide energy for muscle contraction
  • Smooth muscle of airways relaxes - allow more oxygen into lungs
  • Non-essential systems shut down (eg digestion) - focus resources on emergency functions
  • Difficulty focusing on small tasks - brain focused on where threat is coming from

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