3.5.21

Adrenaline

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Adrenaline

Adrenaline is a hormone secreted (discharged) by the adrenal glands. It has different functions:

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Heart rate and blood pressure

  • Adrenaline increases heart rate and blood pressure, and dilates the pupils in our eyes.
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Lungs

  • Adrenaline enlarges the air passages of the lungs and alters metabolism in order to boost the delivery of oxygen and glucose to the brain and the muscles.
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Fight or flight

  • In times of fear or stress, adrenaline is part of the so-called ‘fight or flight’ response, preparing the body to move and think quickly in response to danger.

Jump to other topics

1The Nature & Variety of Living Organisms

2Structure & Functions in Living Organisms

3Organism Functions

3.1Respiration

3.2Gas Exchange

3.3Transport

3.4Excretion

3.5Coordination & Response

4Reproduction & Inheritance

5Ecology

6Biological Resources

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