1. The Nervous System

2. The cell membrane Selectively semi-permiable membrane
Bipolar lipid-protein structure
Gates that allow materials to pass through
The membrane has a charge
Membrane potential
Charge due to ions
K, Na, Ph, Ca, Cl

3. Information Information is a measure of the state of the system
Information is a measure of the change in the state of the system
If system has changed, then responses can be made to the changes.
Nervous system--a system that is designed to detect and respond to changes in state of the system.

4. The cell membrane
Osmosis--the movement of water through a selectively permiable membrane.
Osmotic regulation
Ionic regulation

5. Sponges Simple structure
Outer epidermal layer has cell membranes exposed to the environment
Simple spreading of the signal with degradation with respect to distance

6. Cnidaria Ectoderm and endoderm have basal muscle fibers
Mesoglea separates the two layers
Sub-epidermal nerve net

7. Flatworms Sub-epidermal nerve net
Cephalization--eyes and brain and olfactory cells in auricula
Neuron--functional element of the nervous system
Nerve cell body and fibers going into and out of
Ganglion is a collection of nerve cell bodies
Nerve--collection of fibers (dendrons and axons)
Sensory response and motor response