Chapter4_Spring2011

Chapter4_Spring2011 - Homeostatic Systems and Drugs Chapter...

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Homeostatic Systems and Drugs Chapter 4
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Homeostasis Internal and external changes in the environment Body self-regulates via Equilibrium
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Review of Nervous Systems All nervous systems consist of specialized nerve cells called neurons . Neurons are responsible for conducting the homeostatic functions of the brain and other parts of the nervous system by receiving and sending information. Sending and receiving information is an electrochemical process .
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Transfer of Messages by Neurons The receiving region of the neuron is affected by a chemical message that either excites or inhibits it. Excitatory message - impulse moves from the receiving region of the neuron down the axon to the sending region ( terminal ) - chemical messengers ( neurotransmitters ) are released
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Transfer of Messages by Neurons Neurotransmitters travel and attach to receiving proteins called receptors on target cells. Activation of receptors causes a change in the activity of the target cell; the target cells can be other neurons or cells that make up organs, muscles, or glands.
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Sending Messages by Neurons
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Neurons can send discrete excitatory or inhibitory messages to their target cells. Neurons are distinguished by the type of neurotransmitter they release. Neurotransmitters represent a wide variety
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This note was uploaded on 09/05/2011 for the course PSY 4305 taught by Professor Jackon during the Spring '08 term at Texas Tech.

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Chapter4_Spring2011 - Homeostatic Systems and Drugs Chapter...

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