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Sympathetic and Parasympathetic Nervous Systems

Explore the interplay between the sympathetic and parasympathetic nervous systems during stressful situations. Learn about their functions, effects on organs, and the 'fight or flight' response. Discover how these systems regulate heart rate, respiration, digestion, and more.

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Sympathetic and Parasympathetic Nervous Systems

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  1. Sympathetic and Parasympathetic Nervous Systems Unit 12: Assignment 2 Summary Lesson

  2. Unit 12: Assignment 2 • The Nervous System • The Endocrine System • The inter-relationship between the nervous and endocrine system

  3. Recap of the endocrine system • https://www.youtube.com/watch?v=-S_vQZDH9hY

  4. Nervous System Central Peripheral Brain/Spinal Cord Cranial/peripheral nerves (reflex actions) Somatic Autonomic Nervous System Nervous System (voluntary actions) (regulatory) Parasympathetic Sympathetic

  5. Sympathetic Nervous System • Stressful Situations • Danger • ‘Fight or Flight’ • Neurotransmitters: Acetylcholine (Ach) and Noradrenaline. • Heart, breathing, vision, muscle activity increases

  6. Parasympathetic Nervous System • Returns systems to ‘normal’ • Relaxes after a stressful situation • Neurotransmitter: Acetylcholine. • Reduces activity in heart, lungs, muscles, digestive system.

  7. Heart • Sympathetic: • Increases heart rate • Increases cardiac output • Useful in stressful situations to supply blood to muscles for respiration – energy. • Parasympathetic: • Decreases cardiac output • Decreases heart rate • Returns heart to normal after stressful situation.

  8. Salivary Gland • Sympathetic: • Stimulates amylase production • Increases digestion • Facilitates breakdown of starch into glucose • Respiration • Parasympathetic: • Stimulates watery secretions

  9. Lungs • Sympathetic: • Relaxes smooth muscles of bronchioles • More air can get into lungs • More oxygen for respiration • Parasympathetic: • Contracts smooth muscle of bronchioles • Returns system to normal following high stress.

  10. Eye • Sympathetic: • Ciliary muscles in pupil dilate • More light can enter the eye • Heightens vision • Parasympathetic: • Ciliary muscles in pupil constrict • Less light can enter the eye

  11. Adrenaline: • https://www.youtube.com/watch?v=m2GywoS77qc

  12. Fight or Flight • Some funny applications of fight or flight: • https://www.youtube.com/watch?v=JyUe9Th3lNM&list=PLxt3E0wtpgjyKg7ttcHokgGL0uUfD-cp7

  13. Optical illusions

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