Ch 7 NERVOUS SYSTEM Study Guide 1. What are the 2 main divisions of the NERVOUS SYSTEM? What organs does each contain? 2. Sensory is to afferent as motor is to _______? 3. What types of neurons carry impulses from sensory organs to the brain/spinal cord? What types of neurons carry impulses from brain/spinal cord to muscles and glands? 4. What is the difference between an autonomic response and a somatic response? 5. What is the role of each of the following neuron parts: Dendrites Axons Axon terminal Schwann cells Neurotransmitters 6. How do unipolar, bipolar, and multipolar neurons differ from one another? 7. What does it mean for a membrane to be polarized? 8. What 2 ions are responsible for an action potential? 9. What is the concentration of these ions on either side of the neuron membrane when at rest? What is the overall charge on either side of the neuron membrane when at rest? 10. What happens during depolarization? 11. What happens during repolarization? 12. What happens during hypepolarization? 13. What are the 4 steps of transmission of a signal at the synapse? 14. What are the 6 possible effects that drugs have on transmission of a signal at the synapse? 15. What is a stimulant? A depressant? 16. What are the 3 layers of the meninges that protect the brain? 17. Where is the subarachnoid space? What fluid does it contain? 18. What is the function of cerebrospinal fluid (CSF)? Where else in the brain is there CSF? 19. What is the largest part of the brain? How many lobes does it have? What separates its right half from the left? What are the grooves called? The ridges? 20. What are the 2 parts of the brain stem? 21. Know the function of the following brain parts: Cerebrum Thalamus Hypothalamus Cerebellum Medulla oblongata 22. What is a ventricle? How many occupy the brain? 23. How many cranial nerves does the brain have?