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Unformatted text preview: Chapter 34 BIO 1002 4/15/2008 Chapter 34 : Information Processing: The Nervous System Brain is the central processing unit. Neurons : (aka individual nerve cells) 5 Functions: 1. Receive information 2. Integrate (use) information 3. Conduct signal to its output terminal 4. Transmit signal to other cells/neurons 5. Coordinate their own metabolic activities (using proteins) 4 parts of the neurons: 1) Dendrites : tangle of fibers that branch from the cell body. They receive information from the environment and convert it to electrical signals 2) Cell Body : receives signals from dendrites to produce an action potential (output signal being generated) 3) Axon : long thin fiber extending from the cell body. Carries action potentials to output terminals. Axons also bundled into nerves. Usually wrapped with insulating layers to transmit impulses more rapidly, that has a compound covering. 4) Synaptic terminals : sites at which signals are transmitted to other cells (glands, muscles, or dendrites of other neurons). *Usually involves a group of chemicals called neurotransmitter s. * Path of a nerve impulse : dendrite cell body axon synaptic terminal (See the Figure34-1; be able to label for exam) Mechanisms of Neural Activity : a. Resting potential : resting neurons maintain a constant electrical potential (voltage) across the cell membranes. A neuron is stimulated potential (voltage) across the cell membranes....
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- Spring '08