bsc2010chap48pt1

bsc2010chap48pt1 - Nervous systems perform three...

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There are 2 main branches to the nervous system: 1. Central nervous system (CNS) The CNS is responsible for integration of sensory input 2. Peripheral nervous system (PNS) Sensory receptors are responsive to external and internal stimuli. Such sensory input is conveyed to integration centers in the CNS. The input is interpreted by the CNS and associated with a response. Nervous systems perform three overlapping functions: 1. sensory input 2. integration 3. motor output
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Motor output is the conduction of signals from integration centers to effector cells. Effector cells carry out the body’s response to a stimulus. The signals of the nervous system are conducted by nerves .
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Neuron Structure and Synapses. The neuron is the structural and functional unit of the nervous system. Nerve impulses are conducted along a neuron. Dendrite cell body axon hillock axon Some axons are insulated by a myelin sheath to increase the speed of impulses (action potentials) . Networks of neurons with intricate connections form nervous systems
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Axon endings are called synaptic terminals . They contain neurotransmitters which conduct a signal across a synapse. A synapse is the junction between a presynaptic and postsynaptic neuron .
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A Simple Nerve Circuit – the Reflex Arc. A reflex is an autonomic response. A ganglion is a cluster of nerve cell bodies within the PNS. A nucleus is a cluster of nerve cell bodies within the CNS.
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Neurons differ in terms of both function and shape.
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Types of Nerve Circuits. Single presynaptic neuron
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This note was uploaded on 04/07/2008 for the course BIO bsc2010 taught by Professor Trombley during the Spring '08 term at FSU.

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bsc2010chap48pt1 - Nervous systems perform three...

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