Nervous System - Animals Nervous Animals system system...

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1 Animals: Nervous Animals: Nervous system system Neuron and connection of neurons Outline Outline 1. Key concepts 2. An Overview and Evolution 3. Human Nervous System 4. The Neurons 5. The Electrical Signals 6. Communication between Neurons 7. Nervous System Organization 8. Key Terms 9. Conclusions Key Concepts: Key Concepts: 1. Nervous systems are composed of neurons 2. Neurons are excitable cells 3. With stimulation, the polarity of charge across the membrane reverses from negatively charged inside the cell to being positively charged
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2 Key Concepts: Key Concepts: 4. Action potentials are changes in the polarity of the cell membrane 5. Information flow starts with action potentials, which self propagate along the plasma membrane 6. Chemical signals released from a neuron stimulate or inhibit the adjoining neuron, muscle cell, or gland cell 7. Information flow depends on integration of signals Nervous System Function Nervous System Function Nervous systems perform 3 over lapping functions 1. Sensory input 2. Integration 3. Motor output Evolution of Neural Systems Evolution of Neural Systems 1. No centralized processing a. Nerve “net”> Hydra b. “ring”> starfish 2. Beginning of centralized
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This note was uploaded on 02/16/2010 for the course BIO 49970 taught by Professor Chinnery during the Spring '10 term at University of Texas.

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Nervous System - Animals Nervous Animals system system...

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