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Stress

Biological explanations: Adrenaline and Evolutionary adaptation

  • 3 things to know
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Overview

Recall questions on Adrenaline and Evolutionary adaptation.

What you need to know

Answer each one before you reveal it.

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Key term

Where is adrenaline released from, and what triggers its release?

Key term

How is blood flow redistributed during the adrenaline response?

Who and when

What did Cannon (1932) call this response, and why?

Questions from this subtopic

Each one with the model answer underneath.

  1. 1

    Where is adrenaline released from, and what triggers its release?

    Model answer

    From the adrenal medulla, stimulated by the sympathetic branch of the autonomic nervous system when a threat is detected.

  2. 2

    What does adrenaline do to the heart and circulation?

    Model answer

    It increases heart rate and the force of contraction, raising blood pressure and cardiac output.

  3. 3

    How is blood flow redistributed during the adrenaline response?

    Model answer

    Vessels supplying the gut and skin constrict while those supplying skeletal muscle dilate, directing blood to where it is needed for physical action.

  4. 4

    How does adrenaline make energy available?

    Model answer

    It stimulates the breakdown of stored glycogen into glucose, raising blood sugar so that muscles have fuel.

  5. 5

    What did Cannon (1932) call this response, and why?

    Model answer

    The fight-or-flight response, because it prepares the body either to confront a threat or to escape from it.

  6. 6

    Why is the adrenaline response so much faster than the cortisol response?

    Model answer

    It is triggered directly by nerve impulses reaching the adrenal medulla, whereas the cortisol response depends on a slower chain of hormones travelling in the bloodstream.

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