Chapter 48 Questions-1

Chapter 48 Questions-1 - Ch 48 Multiple Choice Identify the...

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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. Where is the most likely location of a group of nerve cell bodies known as a ganglion? a. in the central nervous system b. in the peripheral nervous system c. anywhere in the nervous system d. within the brain e. within the spinal cord ____ 5. 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 ____ 6. What do muscles, nerves, and glands have in common? a. They synapse with neurons. b. They are referred to as postsynaptic cells. c. They are target cells. d. A and B only e. A, B, and C ____ 7. Integration of simple responses to certain stimuli, such as the patellar reflex, is accomplished by which of the following? a. spinal cord b. hypothalamus
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c. corpus callosum d. cerebellum e. medulla ____ 8. 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. ____ 9. Which of the following statements is false ? a. All cells have a membrane potential. b. Gray matter is the site of neuronal integration. c. Astrocytes can communicate with nerve cells. d. The outside of a cell is negative with respect to the inside of a cell. e. Squid axons are a model system for nerve conductance. ____ 10. If the concentration of potassium in the cytoplasm of a nerve cell with a resting membrane potential of -70 mV were elevated above normal, the new resting potential would a. still be -70 mV. b. be -69 mV or higher. c. be -71 mV or lower. d. be 0 mV. e. reverse polarity. ____ 11. Neurons at rest are not at the equilibrium potential for K + because the cell membrane is a. only permeable to K + . b. slightly permeable to Na + . c. not permeable to Na + . d. not permeable to K + . e.
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Chapter 48 Questions-1 - Ch 48 Multiple Choice Identify the...

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