AP Biology

Nervous SystemsPart 1

Step 1: Reception

Step 2: Transduction

Step 3: Response

Ions and Energy

150 mMKCl

Innerchamber

Outerchamber

–92 mV

Potassiumchannel

5 mMKCl

Artificialmembrane

K+

Cl–

150 mMNaCl

Innerchamber

Outerchamber

+62 mV

Sodiumchannel

15 mMNaCl

Na+

Cl–

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

Axon Nodes ofRanvier

Schwanncell

Myelin sheathNucleus ofSchwann cell

Schwanncell

Nodes of Ranvier

Layers of myelinAxon

0.1 µm