CH 48 VIEW 2009 (1)

CH 48 VIEW 2009 (1) - 2007 APBIO Ch 48 Multiple Choice...

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2007 APBIO Ch 48 Multiple Choice Identify the letter of the choice that best completes the statement or answers the question. ____ 1. Which of the following is (are) characteristic of a simple nervous system? a. a nerve net such as is found in cnidarians b. nerve cell ganglia c. having electrical impulses traveling in both directions d. both A and C e. A, B, and C ____ 2. Which of the following is associated with the evolution of a central nervous system? a. a complete gut b. bilateral symmetry c. radial symmetry d. a closed circulatory system e. excitable membranes ____ 3. An organism that lacks integration centers a. cannot receive stimuli. b. will not have a nervous system. c. will not be able to interpret stimuli. d. can be expected to lack myelinated neurons. e. both A and D ____ 4. The general functions of the nervous system include which of the following? I. integration II. motor output III. sensory input a. I only b. II only c. III only d. I and II only e. I, II, and III ____ 5. Integration of simple responses to certain stimuli, such as the patellar reflex, is accomplished by which of the following? a. spinal cord b. hypothalamus c. corpus callosum d. cerebellum e. medulla ____ 6. The blood-brain barrier a. is formed by tight junctions. b. is formed by oligodendrocytes. c. tightly regulates the intracellular environment of the CNS. d. uses chemical signals to communicate with the spinal cord. e. provides support to the brain tissue. ____ 7. The sodium-potassium pump of neurons pumps a. Na + and K + into the cell. b. Na + and K + out of the cell.
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c. Na + into the cell and K + out of the cell. d. Na + out of the cell and K + into the cell. e. Na + and K + into the cell and H + out of the cell through an antiport. ____ 8. Which of following is a true statement about the threshold potential of a membrane? a. It is equal to about 35 mV. b. It is equal to about 70 mV. c. It opens voltage-sensitive gates that result in the rapid outflow of sodium ions. d. It is the depolarization that is needed to generate an action potential. e. It is a graded potential that is proportional to the strength of a stimulus. ____ 9. After an action potential, the resting potential is restored by a. the opening of sodium activation gates. b. the opening of voltage-sensitive potassium channels and the closing of sodium activation gates. c. an increase in the membrane's permeability to potassium and chloride ions.
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CH 48 VIEW 2009 (1) - 2007 APBIO Ch 48 Multiple Choice...

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