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Question

On feeling the tremor of an earthquake, there was a sudden panic. The heartbeat of a man who was trying to escape from the building suddenly increased. Which hormone is responsible for this sudden increase in heart rate during emergency situtation?

A
Thyroxine
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B
Adrenaline
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C
Parathyroid hormone
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D
None of the above
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Solution

The correct option is B Adrenaline
On feeling the tremor of an earthquake the man was in stress and perceived it as an emergency. As a result adrenaline and noradrenaline are rapidly secreted by adrenal medulla. Adrenaline and noradrenaline are secreted in response to stressful and emergency situations and are called emergency hormones or hormones of fight or flight. These hormones increase the heart beat, the strength of heart contraction and the rate of respiration. As a result, more oxygen gets to your muscles.
Thyroxine is secreted by thyroid gland. It regulates the basal metabolic rate of the body.
Parathyroid hormone is released by parathyoid gland and it is responsible for regulation calcium levels in the blood.
Thyroxine and parathyroid hormones are not secreted in response to stressful situations.

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