Biology 172 Quiz 14: The Nervous System

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Biology 172 Quiz 14: The Nervous System
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2013-12-17 04:13:36
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Biology 172 Quiz 14 Nervous System
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Biology 172 Quiz 14: The Nervous System
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  1. A myelin sheath 
    A.occurs on axons in the grey matter of the nervous system
    B.slows the rate of nerve impulse conduction 
    C.is only found around the fibers of the peripheral nervous system (PNS) 
    D.increases the rate of action potential transmission and may be formed from Schwann cells 
    E.surrounds the cell bodies of most neurons
    D.increases the rate of action potential transmission and may be formed from Schwann cells
    (this multiple choice question has been scrambled)
  2. In the peripheral nervous system, sensory (afferent) pathways may be anatomically distinguished from motor (efferent) pathways because 
    A.sensory neurons are unmyelinated while motor neurons are myelinated 
    B.sensory nerve fibers pass through the dorsal root of the spinal nerves, while motor fibers pass through the ventral root 
    C.nerves containing sensory neurons are larger than those containing motor neurons 
    D.sensory neurons lack synapses while motor neurons have them
    E.sensory neurons enter the central nervous system only through cranial nerves, while motor neurons enter through spinal nerves
    B.sensory nerve fibers pass through the dorsal root of the spinal nerves, while motor fibers pass through the ventral root
    (this multiple choice question has been scrambled)
  3. In the typical spinal reflex arc, such as the knee jerk response, 
    A.the specific neural pathway involved does not go through the brain 
    B.there is only a single neuron connecting the sensory receptor (e.g., stretch receptor) to the effector organ (e.g., muscle tissue)
    C.motor neuron cell bodies lie in ganglia outside the spinal cord 
    D.the sensory neuron from the stretch receptor connects directly to the effector organ without entering the central nervous system
    E.conscious perception of the stimulus is required before a response can be generated 
    A.the specific neural pathway involved does not go through the brain
    (this multiple choice question has been scrambled)
  4. The cerebral cortex is NOT involved much with 
    A.forming complex perceptions from several different senses
    B.initiating voluntary motor responses 
    C.limbic system functions such as motivation, emotion, and memory
    D.autonomic nervous system responses 
    E.processing sensory information 
    D.autonomic nervous system responses
    (this multiple choice question has been scrambled)
  5. The magnitude of depolarization that occurs during the generation of an action potential 
    A.depends on the concentration of neurotransmiters in the synapse
    B.depends upon the effector organ stimulated by the neuron 
    C.is a property of the neuron itself and is independent of the nature of the stimulus 
    D.is proportionate to the intensity of the stimulus
    E.is proportionate to the frequency of stimuli 
    C.is a property of the neuron itself and is independent of the nature of the stimulus
    (this multiple choice question has been scrambled)
  6. The refractory period following the generation of an action potential in the membrane of a neuron
    A.ensures that the action potential will not return from whence it came along the axon 
    B.occurs because the neuron has temporarily run out of chemical energy reserves 
    C.has no influence on the maximum frequency of nerve impulse transmission along the axon 
    D.is a time when all ions may move freely in any direction across the membrane 
    E.requires a threshold level of depolarization to overcome
    A.ensures that the action potential will not return from whence it came along the axon
    (this multiple choice question has been scrambled)
  7. Which structure in the human brain produces neurosecretions that influence hormone production in the pituitary? 
    A.hypothalamus 
    B.olfactory bulb
    C.pons
    D.pineal gland 
    E.thalamus 
    A.hypothalamus
    (this multiple choice question has been scrambled)
  8. With what process is the RAS (reticular activation system) associated? 
    A.thirst - dehydration 
    B.sexual arousal - boredom
    C.sleep - wakefulness 
    D.rage - pleasure 
    E.hunger - satiety
    C.sleep - wakefulness
    (this multiple choice question has been scrambled)
  9. During the generation of an action potential, what circumstances contribute to the diffusion of sodium ion into the axon? 
    A.all of these 
    B.none of these
    C.the electrical (charge) gradient across the membrane 
    D.the sodium ion gradient across the membrane 
    E.the opening of sodium channels in the membrane
    A.all of these
    (this multiple choice question has been scrambled)
  10. In human beings, the cerebellum functions in 
    A.storage and recall of memories 
    B.controlling hormone release by the pituitary
    C.closing the circuits of spinal reflex arcs
    D.connecting the two halves of the cerebrum 
    E.controlling and coordinating muscular activity 
    E.controlling and coordinating muscular activity
    (this multiple choice question has been scrambled)
  11. Neurotransmitters
    A.bind to receptors on the postsynaptic membrane 
    B.move in and out through the membrane creating an impulse 
    C.are always excitatory 
    D.are released from the postsynaptic membrane
    E.travel down the axon as the nerve impules or action potential
    A.bind to receptors on the postsynaptic membrane
    (this multiple choice question has been scrambled)
  12. Neurons in the CNS
    A.can neither divide nor regenerate 
    B.can divide and regenerate
    C.can divide but not regenerate 
    D.cannot divide but can regenerate 
    E.can divide and differentiate into neuroglial cells
    D.cannot divide but can regenerate
    (this multiple choice question has been scrambled)
  13. Neurons that carry nerve impulses to target organs and influence the activities of these target organs are ______ neurons.
    A.sensory 
    B.glial 
    C.motor 
    D.inter
    E.afferent 
    C.motor
    (this multiple choice question has been scrambled)
  14. The white matter of the spinal cord 
    A.provides structural support and protection to the spinal cord
    B.mediates sensory and motor neurons in determining reflexes 
    C.is a collection of nerve cell bodies 
    D.carries information to and from the brain
    E.is a collection of unmyelinated fibers 
    D.carries information to and from the brain
    (this multiple choice question has been scrambled)
  15. When an action potential arrives at a chemical synapse, 
    A.nothing happens
    B.the membrane of the presynaptic neuron pushes against the postsynaptic neuron causing depolarization of its membrane 
    C.neurotransmitters released from vesicles in the presynaptic neuron diffuse across the synaptic cleft to the postsynaptic neuron 
    D.an electrical spark jumps from the presynaptic neuron to the postsynaptic neuron 
    E.the action potential of the presynaptic neuron directly stimulates depolarization of the membrane of the postsynaptic neuron
    C.neurotransmitters released from vesicles in the presynaptic neuron diffuse across the synaptic cleft to the postsynaptic neuron
    (this multiple choice question has been scrambled)

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