Adrenal Gland Emergency Hormone


 
 
Concept Explanation
 

Adrenal Gland Emergency Hormone

We have two adrenal glands, one on each kidney. The adrenal glands secrete the hormone called adrenaline or epinephrine. This hormone is secreted when an individual is under great physical or emotional stress or feels threatened by some kind of danger. Excitement generally stimulates adrenaline secretion.

Effects produced by adrenaline hormone

  • Adrenaline increases the heartbeat, rate of respiration and blood pressure.
  • More air is inhaled as the diaphragm and the rib muscles contract, expanding the chest cavity.
  • Adrenaline constricts all the blood vessels except those that supply blood to the heart muscles and skeletal muscles. As the small arteries around the digestive organs constrict, blood is diverted to the skeletal muscles to carry out a response.
  • Adrenaline is calledfight and flight hormone because there is a surge of adrenaline when a person is fighting or preparing to fight or running away from danger. The changes caused by adrenaline prepare the body to react during an emergency. Hence, adrenaline is also called theemergency hormone’.
  • Sample Questions
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    Question : 1

    Excitement generally stimulates _____________ secretion

    Right Option : C
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    Explanation
    Question : 2

    Select the mis-matched pair:

    Right Option : A
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    Explanation
    Question : 3

    The hormone that combats emergency situations is _______________

    Right Option : C
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    Explanation
     
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