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Chapter 2: Drug Distribution: Getting To the Brain (pages 33-39) Read Chapter 2, pages 33 to 39 in the text, Substance Abuse Counseling Text 1. The brain is divided into _____________ ________________. 2. The left side of the brain is the locus of ________________ thought. 3. The right side of the brain is the locus of ________________ thought. 4. Chemical messengers are called______________________. 5. Neurons have a central body with wispy tendrils called ___________________. 6. ______________ are long slender on the neuron opposite the dendrites. 7. The brain consists of what three basic parts? 8. Name 7 parts of the neuron. 9. What is a synapse or synaptic gap? 1 10. Define a receptor site. 11. What are vesicles? 12. What is the blood brain barrier? 13. What kind of substances can cross the blood brain barrier? 14. Drugs that can cross the blood brain barrier are called _____________________. 15. What two drugs are related to the neurotransmitter GABA? 16. Dopamine-containing neurons relay messages of ________________________. 17. All major drugs of abuse except hallucinogens have a _____________________ or enhancing effect on the brain. 2 The Central Nervous System affects the following systems: The Brain Respiration Digestion Excretory Function Endocrine Function Reproductive Function Enables us to reason and make judgments The Autonomic Nervous System Controls: Circulation Digestion Respiration Glandular outputs Genital reactions Sympathetic responses Somatic Nervous System Includes: Sensory neurons that reach the skin, muscles and joints Responsible for relaying information about muscles and limb position Transmits instructions back to skeletal The process of message transmission: Incoming electrical signals force the release of neurotransmitters from the vesicle They are sent across the synaptic gap On the new neuron, the neurotransmitters fit themselves into receptor sites The receptor sites open the ion molecule gate This allows the electrical charge in or out When enough electrical charge is achieved, the next signal fires and the process continues Once the message is received, neurotransmitters return to the synaptic gap and are reabsorbed by reuptake ports Auto receptors monitor the amount of neurotransmitters needed for the transmission 3