alleryA student is suddenly chased by a stray dog. The hormone that quickly readies the body for the chase is:
AAdrenaline from adrenal
BInsulin from pancreas
CThyroxine from thyroid
DParathormone from parathyroid
Answer & Solution
Correct answer: A. 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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