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Page 1: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

Page 2: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

I. Functions of the Nervous SystemA. Nervous system is our processing system, and the system that keeps us in contact with the outside world. Intro Animation

B. Roles of the nervous system: 1. Coordination of movement

2. Response to environmental stimuli

3. Intelligence

4. Self-awareness (consciousness)

5. Thoughts6. Emotions

http://www.bbc.co.uk/schools/gcsebitesize/science/edexcel/responses_to_environment/thenervoussystemact.shtml

Page 3: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

II. Composition of the Nervous SystemA. Made up of nerve cells called NEURONSwhich are specialized to carry nerve impulses

Page 4: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

C. The nervous system is divided into branches

Page 5: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

Neurons: Structure and FunctionI. Parts of a NeuronA. DENDRITE: conducts message towards

the cell body. AnimationB. AXON: conducts message away from the cell body.

http://www.garyfisk.com/anim/neuronparts.swf

Page 6: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

C. SYNAPSE: a junction between neurons; where message jumps from one neuron to another.

Page 7: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

D. MYELIN SHEATH: insulates the nerve fibreelectrically.

E. SCHWANN CELLS: cells that secrete the myelin sheath.

Page 8: I. Functions of the Nervous System · I. Functions of the Nervous System A. Nervous system is our processingsystem, and the system that keeps us in contact with the outside world

F. NODE OF RANVIER: gaps in the myelin sheath, they speed up transmission of nerve impulses.

G. CELL BODY: conducts the normal metabolic functions of the cell.

H. FIBERS: composed of dendrites and axons.

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