1. NERVOUS SYSTEM II PP

2. NEURONS

3. Axons: extension of cell body
Axon terminal: end of the axon
Dendrites: receive action potentials (electrical impulse/message) from other neurons
Synapse: gap between neurons
Myelin sheath: lipid layer around axon (insulator)
Schwann cells: produce myelin sheath

4. SENSORY NEURONS
Most people think that we have only five senses but your body maintains homeostasis with more than 25 different types of senses
Sensory neurons detect (sense) a stimulus to be processed by the central nervous system
Sensory neurons have specific shapes to do their job
Some body functions require more than one type of sensory neuron (i.e. balance)

7. TASTE
SMELL

8. Taste and Smell
Chemoreceptors
Scent and taste are just chemicals

10. Vision Photoreceptors
2 types: cones (bright light) and rods (dim light)

12. Hearing and balance Mechanoreceptors
The neurons look like hair and move to the vibration of air (hearing) or movement of fluid (balance)

14. Pressure and Temperature
Mechanoreceptors and thermoreceptors

15. Tissue damage
Pain receptors

16. NERVE IMPULSES

18. Think of the impulse as electrical and negative
Resting potential: inactive due to “negatively” charged inside as compared to impulse
Action potential: transmission of an electrical impulse by making inside more “positive”

19. When the impulse reaches the end (axon terminal) neurotransmitters are released from the neuron, into the synapse, to receptors in the next cell (dendrite)