1. Nervous System The ANS and Simple Behaviour Patterns

2. Nervous System

4. Nervous System:  Conscios activity controlled by the voluntary (somatic) nervous system  Unconscious activity controlled by the autonomic nervous system

5. Autonomic Nervous System

6.  Sympathetic System The motor neurones secrete noradrenaline at the synapse  Parasympathe tic The motor neurounes secrete acetylcholine at the synapse

7. Sympathetic Causes the “fight or flight”  Divert blood from the gut to the lungs, heart and voluntary muscle  Increase supply to the muscles  The lungs absorb more oxygen  More blood available for the heart and lungs

8. Parasympatheic  Prepare the body for rest  Decrease heart beat rate  Decrease ventilation rate  Increase peristalsis in the gut, food can be digested

9. Comparison of the sympathetic and parasympathetic nerovs systems FeatureSysmpatheticParasympathetic Transmitter substance at synapses NoradrenalineAcetylcholine Heart rateSpeeds upSlows down IrisDilatesConstricts movements of digestive tract Slows downSpeeds up SweatingStimulatedNot stimulated

10. Heart Beat

11. Affect on heart rate  Sympathetic nerves increase the rate of cardiac muscle contraction  Parasympathetic nerves relax muscles

12. ANS 1. Blood stretches the baroreceptors 2. Action potential sent 3. Impulse send along the motor vagus nerve 4. SAN slow the rate 5. Blood put pressure 6. Bainbridge reflex 7. Baroreceptors control the pressure of blood flowing to the head