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1. 2 c d e 3 4 axon Cell body dendron 5 f 6 Node of Ranvier White fat from Schwann cell.

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Presentation on theme: "1. 2 c d e 3 4 axon Cell body dendron 5 f 6 Node of Ranvier White fat from Schwann cell."— Presentation transcript:

1 1

2 2 c d e

3 3

4 4 axon Cell body dendron

5 5 f

6 6 Node of Ranvier White fat from Schwann cell

7 7 Myelin sheath: Faster nerve impulse, Protection, Insulation axon

8 8 Sensory neurone Motor neurone Relay neurone CNS

9 91 3 2

10 10 Cell body

11 11

12 12 Na-K pump Facilitated diffusion

13 13  -ve b c d

14 14 Action Potential: change of membrane permeability to Na & K channel opens = permeability increases

15 15 K  Na=0 (K outflux) K  Na  (Na influx) K  Na=0 (K outflux) K  Na=0 (too much K outflux) K  Na=0 (K outflux)

16 16 K  Na=0 K  Na  K  Na=0 K ,Na=0 K  Na=0 depolarization repolarization hyperpolarization polarization

17 17 Na per K per potential difference K per>Na per Na per>>K per K per >>Na per K per> Na per

18 18        freq. only

19 19 Wave of negativity along axon surface

20 20 depolarization polarization repolari zation Pump out Na & prepare for next impulse p.d

21 21

22 22 1.Axon Diameter (thicker > faster) 2.Myelin Sheath (faster) 3.Temperature (higher > faster) 1.Axon Diameter (thicker > faster) 2.Myelin Sheath (faster) 3.Temperature (higher > faster)

23 23postsynaptic presynaptic presynaptic

24 24 Synaptic knob Cell body Nucleus of cell body axon

25 25 Synaptic vesicle Presynaptic membrane Postsynaptic membrane Synaptic cleft Synaptic knob mitochondria

26 26postsynaptic presynaptic a b c depolarization d) Na influx, depolarizarion

27 27

28 28

29 29 ab cd ef

30 30 1.Ensure impulse to pass in one direction 2.Prevent damage of effectors due to over stimulation 3.Act as junctions for dividing up and merging of neurones 1.Ensure impulse to pass in one direction 2.Prevent damage of effectors due to over stimulation 3.Act as junctions for dividing up and merging of neurones

31 31


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