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Page 1 HUMAN BIOLOGY SECTION EXAM PREP GUIDE BIOL 164, Winter 2012, Section Exam 4 : Ch. 7 (Neurons), Ch. 8 (The Nervous System), and Ch. 9 (Sensory Systems) KEY TO MULTIPLE CHOICE QUESTIONS – The correct answers are highlighted in yellow. CHAPTER 7 1. Which of the following carry information (signals) toward the cell body of a neuron? a. axon b. dendrite c. glial cells d. Schwann cells e. oligodendrocytes 2. Which are the supporting cells of the nervous system? a. axons b. glial cells c. neurons d. nerve cells e. dendrites 3. A muscle twitch results from the impulse carried by a(n) _____ neuron. a. association b. afferent c. efferent 4. By definition a nerve consists of _____. a. a neuron and the supporting cells making up the myelin sheath b. a single dendrite, cell body and axon c. several neuron processes bundled together in the CNS d. several neuron processes bundled together in the PNS 5. Axons with a myelin sheath carry impulses _____ unmyelinated axons of the same size. a. faster than b. slower than c. at the same speed as 6. Together, the conduction of an action potential along an axon and the transmission of the impulse at a synapse make up a(n) _____ signal. a. chemical b. electrical c. electrochemical 7. In which of the following ways may ions cross the cell membranes of neurons? a. active transport using ATP b. diffusion through leak channels c. diffusion through gated channels that are open d. any of the above 8. If the inside of the neuron is negatively charged compared to the outside with a value of about -70 mV, then the neuron must be _____. a. in the middle of an action potential b. at threshold c. in the refractory period d. resting 9. What is the sudden and rapid reversal in membrane charge that occurs when a neuron is stimulated? a. action potential b. resting potential c. nerve impulse d. both a and c e. both b and c 10. Action potentials are all-or-nothing. Which of the following best summarizes this principle? a. an action potential can vary in both strength and duration b. every time the threshold stimulus is reached an action potential of the same strength will be generated c. several stimuli arriving at once causes a stronger action potential d. a weaker stimulus causes a weaker action potential 11. Which of the following is true of the refractory period? a. the neuron cannot be stimulated to generate another action potential until it is over
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This note was uploaded on 03/12/2012 for the course BIOL 164 taught by Professor Tonychennault during the Winter '12 term at Clark College.

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