Which hormone prepares the body for 'fight or flight'?
Answer and explanation
Correct answer: D. Adrenaline
- Step 1: In response to acute perceived physical or psychological threats, the sympathetic nervous system triggers rapid emergency endocrine adaptations.
- Step 2: The adrenal medulla releases adrenaline (epinephrine), which accelerates heart rate, dilates bronchioles, and stimulates glycogenolysis to mobilize glucose for immediate skeletal muscle energy expenditure.
Answer
Adrenaline.
Why not the others: 'Insulin' promotes glycogen synthesis and lowers blood glucose during resting states; 'Thyroxine' modulates long-term resting basal metabolic rates; 'Oestrogen' regulates female reproductive development and secondary sex characteristics.
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