Bodily responses to stress
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The Sympathetic Adrenal Medullary Axis. The Hypothalamic Pituitary Adrenal Axis. Bodily Responses To Stress. The Nervous System. What is stress, and what does it do to us?. http:// www.youtube.com/watch?v=xb7NnEpfvSM&NR=1&feature=endscreen

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Bodily Responses To Stress

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Bodily responses to stress

The Sympathetic Adrenal Medullary Axis

The Hypothalamic Pituitary Adrenal Axis

Bodily Responses To Stress

The Nervous System


What is stress and what does it do to us

What is stress, and what does it do to us?

http://www.youtube.com/watch?v=xb7NnEpfvSM&NR=1&feature=endscreen

http://www.youtube.com/watch?NR=1&feature=endscreen&v=4g25d7_Afmc

( discovery channel police man)


Bodily responses to stress

The nervous

system

CNS (central

nervous system)

PNS (peripheral

nervous system)

Brain

Spinal cord

SNS (somatic

nervous system)

ANS (autonomic

nervous system)

Sensory and motor

nerves (voluntary)

Sympathetic

arousal

(involuntary)

Parasympathetic

arousal

(involuntary)


The nervous system

The Nervous System

Peripheral Nervous System

Central Nervous System

Brain

Spinal Chord

Autonomic Nervous System

[Muscles]

Somatic

Nervous System

[Bones]

Sympathetic Nervous System

Parasympathetic Nervous System


The nervous system1

The Nervous System

Sympathetic Nervous System

  • The Sympathetic Branch of the Autonomic Nervous System is responsible for the SAM Response to Stress.

  • It is responsible for Physical Arousal of the body when dominant (due to a Stressor).


The nervous system2

The Nervous System

Parasympathetic Nervous System

  • The Parasympathetic Branch of the Autonomic Nervous System is responsible for Counteracting the SAM Response to a Stressor.

  • It is responsible for Relaxation and Energy Conservation.


The sympathetic adrenal medullary axis

The Sympathetic Adrenal Medullary Axis

  • SAM – The Immediate Response to a Stressor.

  • The Hypothalamus:

    • Activates the Sympathetic Branch of the Autonomic Nervous System - ANS.

  • This sends Neuron-Messages to the Inner Core of the Adrenal Gland, the Adrenal Medulla.

  • This results in the secretion of Adrenaline and Nor-adrenaline.


Bodily responses to stress

Hypothalamus

Part of the brain!


The sympathetic adrenal medullary axis1

The Sympathetic Adrenal Medullary Axis

  • SAM – The Immediate Response to a Stressor.

  • The Results of Adrenaline and Nor-Adrenaline

  • Adrenaline and Nor-Adrenaline are released into the Bloodstream.

  • This causes the Fight or Flight Response.

  • Physiological changes occur such as:

  • Increased Oxygen & Glucose to Brain & Muscles

  • Increased Heart Rate

  • Deeper Respiration

  • Dilating Pupils

  • Digestion Suppression


The sympathetic adrenal medullary axis2

The Sympathetic Adrenal Medullary Axis

The Hypothalamus

The ANS

Activates

Causes

The Adrenal Medulla

To Release…

Adrenaline and Nor-Adrenaline


The hypothalamic pituitary adrenal axis

The Hypothalamic Pituitary Adrenal Axis

  • HPA – The Long Term Response to a Stressor.

  • The Hypothalamus:

    • Activates the Pituitary Gland.

  • This causes ACTH [Stress Hormone] to be released.

  • This stimulates the Outer Edge of the Adrenal Gland, the Adrenal Cortex.

  • This allows the production of Glucocorticoids – Glucose and Cortisol.


Bodily responses to stress

Hypothalamus

Part of the brain!


Bodily responses to stress

Pituitary Gland

An endocrine gland!


Bodily responses to stress

Adrenal cortex

(remember it by thinking of it as the ‘covering’ layer of the adrenal gland!

Adrenal Cortex

An endocrine gland!


The hypothalamic pituitary adrenal axis1

The Hypothalamic Pituitary Adrenal Axis

  • HPA – The Long Term Response to a Stressor.

  • The Results of Glucose and Cortisol

  • Glucocorticoids are released into the Liver to release stored Glucose.

  • This causes the Immune System to be suppressed.

  • Other Effects Include:

  • ✓ Heightened and Maintainable Energy Supply

  • ✓Lower Pain Sensitivity

  • ✗Lower Immune Response

  • ✗High Blood Pressure


The hypothalamic pituitary adrenal axis2

The Hypothalamic Pituitary Adrenal Axis

The Hypothalamus

Pituitary Gland

Activates

Causes the Release of…

Adrenal Cortex

ACTH

Which Acts on…

Cortisol and Glucose

To Release…


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