The document discusses the structure and function of neurons. It describes how dendrites receive signals from other neurons at synapses. The neuron cell body contains the nucleus, and a long axon carries signals to terminals that connect to other neurons. Signals travel as electrochemical pulses called action potentials. At the synapse, neurotransmitters are released from the terminal buttons which can either continue or end the action potential in the receiving neuron. Acetylcholine is described as a neurotransmitter involved in muscle movement, and how Botox works by inhibiting acetylcholine at motor neuron synapses, temporarily paralyzing muscles.

1. You Have Some Nerve

2. The Neuron

3. Dendrites
Dendrites

4. Dendrites
Dendrites
Cell

5. Dendrites
Dendrites
Cell
Axon

6. Dendrites
Dendrites
Cell
Axon
Terminal
Buttons

8. Synapse

9. Presynaptic Neuron

10. Presynaptic Neuron
Lots of chemical activity

11. Post Synaptic Neuron

12. The Action Potential

13. Th Action Potential

14. Th Action Potential

15. Th Action Potential

16. Th Action Potential

17. Th Action Potential

18. Th Action Potential

19. Th Action Potential

20. Th Action Potential

21. Terminal
Buttons
Dendrites

22. Terminal
Buttons
Dendrites

23. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

24. Terminal
Buttons
Dendrites

25. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

26. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

27. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

28. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

29. Terminal
Buttons
Dendrites
Neurotransmitter
Receptor

30. Terminal
Buttons
Dendrites
Excitatory: Continue the action potential

31. Terminal
Buttons
Dendrites
Inhibitory: End the action potential

32. Excitatory or Inhibitory?
Both kinds received at once
Excitatory has to pass a certain threshold to
create an Action potential

34. Neurotransmitters
Acetylcholine
Present in the synapses in the nerves at our
muscles.
More Acetycholine in the synapse: Binds
with receptors at the dendrite to effect an
action potential, and thus, create muscle
movement
Less acetylcholine in the synapse: no
action potentials...no muscle movement

35. Neurotransmitters
BOTOX

37. BOTOX
Inhibits
Acetylcholine

38. Acetylcholine is the
neurotransmitter, which,
when abundant in our
muscle synapses, control
muscle movement

39. BOTOX
keeps
acetylcholine out
of the synapse

40. So the muscles
that cause
wrinkles are
temporarily
paralyzed