front 1 which of the following is not a function of astrocytes? | back 1 provide the defense for the CNS |
front 2 which of the following choices below describes the ANS | back 2 motor fibers that conduct nerve impulses from the CNS to skeletal muscles |
front 3 what does the central nervous system use to determine the strength of a stimulus? | back 3 frequency of action potentials |
front 4 bipolar neurons are commonly | back 4 found in the retina of the eye |
front 5 which of the followings describes the nervous system intergrative function | back 5 analyzes sensory information stores information makes decisions |
front 6 which of the followings is not characteristic of neurons? | back 6 they are mitotic |
front 7 the period after an initial stimulus when a neuron is not sensitive to another stimulus is the | back 7 absoulute refractory period |
front 8 collections of nerve cell bodies outside the central nervous system are called | back 8 ganglia |
front 9 a neuron that has as its primary function the job of connecting other neurons is called an | back 9 association neuron |
front 10 saltatory conduction is made possible by | back 10 the myelin sheath |
front 11 which of the following is not a chemical class of neurotransmitters? | back 11 nucleic acid |
front 12 select the correct statement regarding synapses | back 12 the synaptic cleft prevents an impulse from being transmitted directly from one neuron to antoher |
front 13 an inhibitory postsynaptic potential (IPSP) is associated with | back 13 hyperpolarization |
front 14 when a sensory neuron is excited by some form of energy, the resulting graded potential Is called a(n) | back 14 generator potential |
front 15 which of the following neurotransmitters inhibits pain and is mimicked by morphine, heroin, and methadone | back 15 endorphin |
front 16 which of the followings describes the excitatory postsynaptic potential | back 16 short distance depolarization |
front 17 which of the followings is not a recognized structural classification for neurons | back 17 pseudopolar |
front 18 the most abundant class of neuron in the central nervous system is | back 18 multipolar |
front 19 the rabies virus travels to the CNS via | back 19 retrograde intraaxonal transport |
front 20 sensory neurons of the PNS are | back 20 unipolar |
front 21 which of the following is not involved in creating the resting potential of a neuron | back 21 membrane permeability for sodium ions greater that potassium ions |
front 22 the following are the main steps in the generation of an action potential. 1. sodium channels are inactivated 2. voltage-gated potassium channels open and potassium moves out of the cell, initiating repolarization. 3.sodium channels regain their normal properties. 4.a graded depolarization brings an area of an excitable membrane to threshold. 5.a temporary hyperpolarization occurs. 6.sodium channel activation occurs. 7. sodium ions enter the cell and depolarization occurs. | back 22 d.4,6,,7,1,2,3,5. |
front 23 in the process of continuous action potential propagation, | back 23 a, b, and c |
front 24 which of the following types of nerve fiber possesses the fastest speed of impulse propagation | back 24 type A |
front 25 which of the following does not influence the time necessary for a nerve impulse to be transmitted | back 25 whether or not the impulse begins in the CNS |