How does adrenaline affect blood glucose concentration during a fight-or-flight response to threat or stress?
It increases blood glucose concentration, making more glucose available in the blood.
AQA GCSE Combined Science: Trilogy (8464) — Biology — Higher · 4.5.3.6
Revise AQA GCSE Combined Science: Trilogy (8464) — Biology — Higher specification point 4.5.3.6, Feedback systems (HT only), with free active-recall flashcards. Flip through the set or review every question and answer below.
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How does adrenaline affect blood glucose concentration during a fight-or-flight response to threat or stress?
It increases blood glucose concentration, making more glucose available in the blood.
What effect does adrenaline have on heart rate?
It increases heart rate, separately from its effect on blood glucose.
What is a set point in homeostasis?
The normal target value of an internal condition.
How does negative feedback respond to a change away from a set point?
The change is detected and triggers responses that oppose the change.
What happens to the stimulus for negative-feedback responses as an internal condition returns towards its set point?
The stimulus diminishes.
How stable does negative feedback keep an internal condition?
Relatively stable near its set point, rather than fixed at exactly one value.
When are the adrenal glands stimulated to release adrenaline?
During fear or stress.
What effect does adrenaline have on heart rate?
It increases heart rate.
How does an increased heart rate support the fight-or-flight response?
It helps deliver more oxygen and glucose to the brain and muscles, supporting rapid activity.