Q. Unmyelinated fibres differ from myelinated fibers in that they ______________? Have increased excitability Have to nodes of Ranvier Have no power of regeneration Have no association of Schwann cells Answer: Have to nodes of Ranvier
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Q. Which of the following is not true for myelinated nerve fibers? Impulse through myelinated fibers is slower than non- myelinated fibers Membrane currents are generated at nodes of Ranvier Saltatory conduction of impulses is seen Local anesthesia is effective only when the nerve is not covered by myelin sheath Answer: Impulse through myelinated fibers
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Q. Nerve cells form long projections called ________. soma axons dendrites synapses Answer: axons
Q. What is the outermost membrane surrounding the brain called? pia mater arachnoid mater dura mater alma mater Answer: dura mater
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Q. Chemicals called ________ are stored in neurons and released when the cell is stimulated by a signal. toxins cytokines chemokines neurotransmitters Answer: neurotransmitters
Q. What term refers to an inflammation of brain tissues? encephalitis meningitis sinusitis meningoencephalitis Answer: encephalitis
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Q. The nerve that contains sensory fibers that are involved in hearing is cranial nerve II cranial nerve III cranial nerve V cranial nerve VIII cranial nerve IX Answer: cranial nerve VIII
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Q. Preparing the body for “fight-or-flight” response during threatening situations is the role of the: sympathetic nervous system cerebrum parasympathetic nervous system somatic nervous system afferent nervous system Answer: sympathetic nervous system
Q. Which one of the following is the correct sequence of nerves that exit the spinal cord, going from superior to inferior? thoracic spinal nerves, cervical spinal nerves, lumbar spinal nerves, sacral spinal nerves cervical spinal nerves, lumbar spinal nerves, thoracic spinal nerves, sacral spinal nerves thoracic spinal nerves, cervical spinal nerves, sacral spinal nerves,
Q. Loss of muscle coordination results from damage to the: cerebrum hypothalamus cerebellum thalamus midbrain Answer: cerebellum
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