Brain Function and Chemistry

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What kind of machine is this? What is it for?

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Some of the most common types of over-the-counter medications (OTCs) are pain relievers

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depressants Stimulants How do you think these drugs produce their effects?

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Outcome: Brain Function and Chemistry By the end of the lesson you will be able to: Describe modern technologies used to study the human brain. Describe how an imbalance of neurotransmitters can cause illness. Explain how drugs change brain chemistry.

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Scientists study the functions and chemistry of the brain. KEY CONCEPT

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Today, scientists study the brain without surgery. New techniques improve our understanding of the brain

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There are three common technologies. CT uses x-rays to view structure. PET detects activity, where glucose is used, in the brain. MRI uses magnetic fields and radio waves to view structure.

Changes in brain chemistry can cause illness. :

Changes in brain chemistry can cause illness. Different neurotransmitters relate to different functions. some stimulate impulses some prevent impulses synapse Normal neurotransmitter receptor

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Abnormal levels of neurotransmitter can cause illness . schizophrenia depression Normal Schizophrenic Depressed

Drugs alter brain chemistry. :

Drugs alter brain chemistry. Addiction is the physiological need for a substance. Tolerance occurs when more drug is needed to produce an effect. Drugs might cause desensitization or sensitization. desensitization: more neurotransmitter leads to fewer receptors sensitization: less neurotransmitter leads to more receptors. When the amount of neurotransmitter becomes abnormal, the adjacent neuron adapts.

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Stimulants cause more action potentials may increase neurotransmitter in synapse may decrease removal of neurotransmitter in synapse cocaine neurotransmitter synapse

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Depressants cause fewer action potentials. may produce neurotransmitter that prevent impulses may slow release of neurotransmitter that generates impulses

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HOMEWORK Research Information Answer this question: What causes sensitization and desensitization? You can find the information in your book on pages 835-839. Study these pages from your book. Some questions will come in the different evaluations.

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