Neural Communication

Neural Communication - Neural Communication 2. 3. 4....

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Neural Communication 2. 3. 4. Describe the structure of a neuron, and explain how neural impulses are generated. A neuron consists of a cell body and branching fibers: The dendrites receive information from sensory receptors or other neurons, and the axons pass that information along to other neurons. A layer of fatty cells, called the myelin sheath, insulates the fibers of some neurons and helps speed their impulses. A neural impulse fires when the neuron is stimulated by pressure, heat, light, or chemical messages from adjacent neurons. Received signals trigger an impulse only if the excitatory signals minus the inhibitory signals exceed a minimum intensity called the threshold. The impulse, called the action potential, is a brief electrical charge that travels down the axon rather like a line of dominoes falling. The neuron's reaction is an all-or- none response. Describe how nerve cells communicate, and discuss the impact of neurotransmitters and drugs on human behavior. When electrical impulses reach the axon terminal, they stimulate the release of chemical
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Neural Communication - Neural Communication 2. 3. 4....

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