AP Biology Nervous Systems Part 1

Step 1: Reception

Step 2: Transduction

Step 3: Response

150 mM KCl 150 mM NaCl –92 mV +62 mV Inner chamber Outer chamber Inner Ions and Energy –92 mV +62 mV Inner chamber Outer chamber Inner chamber Outer chamber 150 mM KCl 5 mM KCl 15 mM NaCl 150 mM NaCl Cl– K+ Na+ Cl– Potassium channel Sodium channel Artificial membrane

Evolution of a Nervous system in Animals

Overview of the Nervous System

CNS vs. PNS

Neuron structure

Synapse and Neurotransmitter

Glial Cells (Like a house frame … but for a brain

Schwann Cells OR Oligiodendrocytes Nodes of Ranvier Layers of myelin Axon Schwann cell Schwann cell Axon Nodes of Ranvier Nucleus of Schwann cell Myelin sheath 0.1 µm