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

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: Parasympathetic: 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:

12. Fight or Flight Some funny applications of fight or flight:

13. Optical illusions