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A student is suddenly chased by a stray dog. The hormone that quickly readies the body for the chase is:
A{'text': 'Adrenaline from adrenal'}
B{'text': 'Insulin from pancreas'}
C{'text': 'Thyroxine from thyroid'}
D{'text': 'Parathormone from parathyroid'}
Answer & Solution
Correct answer: A. {'text': 'Adrenaline from adrenal'}
1. Sudden stress triggers the fight-or-flight response.
2. The adrenal medulla releases **adrenaline** within seconds.
3. Adrenaline raises heart rate, dilates pupils and pushes more glucose into blood for muscle use.
4. Insulin stores glucose (opposite need); thyroxine controls long-term metabolism; PTH regulates calcium.
5. Hence adrenaline is the emergency hormone.
_Source: Selina Concise ICSE Class 8 Biology Ch 5 "Endocrine System and Adolescence", Major endocrine glands_
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