Texas A&M University

PSYC 107

Chapter 3 Quiz

1)Glia cells support neurons.

2. Dopamine is a neurotransmitter.
3. Communication between neurons is by the axon.
4. The strength of an action potential stays the same.
5. The size and shape of neurons can vary.
6. During an action potential, which ions cross the axon membrane, and in which direction?
7. Which part of a neuron releases neurotransmitters into the synapse?
8. The                                   is a single, long, thin, straight fiber with branches near its tip. Some are covered with                                  , an insulating sheath that speeds up the transmission of impulses.
9. What was Otto Loewi’s evidence that neurons communicate by releasing chemicals?
10. You would feel a pinch on your shoulder (very slightly) sooner than a toe pinch. Why?
11. The part of a neuron receiving messages is the                                                     . The part sending messages is the                                                              
12. A single neuron can have many
13. After neurotransmitter molecules detach from their receptor, some of them diffuse away. What happens to the others?
14. What is a neurotransmitter?

15. What is the relationship between neurotransmitters and their receptors?
16. A mouse, a dog, and a giraffe get toe pinches at the same time. Which responds fastest?
17. The three parts of a neuron are the cell body, the                                                                          , and the               .
18. If a drug prevents the inhibitory neurotransmitter GABA from attaching to its receptors, what happens to the postsynaptic cell?
19. Parkinson's disease results from a deficiency in which neurotransmitter?
20. Suppose your finger touches something. WHEN do you get the sensation?
21. In what way do synaptic messages differ from the way computers store information?
22. The all-or-none law applies to
23. In comparison to other body cells, what is distinctive about neurons?
24. One of the main symptoms of Parkinson's disease is
25. How does L-DOPA affect someone with Parkinson’s disease?
26. Which of the following is a widely used treatment for Parkinson's disease?
27. What is the long fiber that conducts impulses from a neuron’s cell body toward another cell?