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Temporal summation refers to the effects of successive, rapid impulses received from a single
a. temporal summation.b. spatial summation.c. actuation.d. facilitation.neuron on the same synapse. Spatial summation refers to the combined effect of impulses from a number of neurons on a single synapse at the same time. Facilitation refers to the effects of excitatory postsynaptic potentials (EPSPs) on the plasma membrane potential. Actuation is not a process that relates to neural impulse transmission.47.Which structure is involvedin pain transmission?a. Posterior hornb. Substantia gelatinosac. Anterior hornd. Dorsal root gangliab. Substantia gelatinosaThe substantia gelatinosa is a structure involved in pain transmission. The anterior or ventral horn contains nerve cell bodies for efferent pathways leaving the spinal cord. The posterior horn (dorsal horn) is composed primarily of interneurons and axonsfrom sensory neurons. The dorsal root ganglion is part of the sensory ganglion.48.Which is a function of the thalamus?a. Major integrating center for afferent impulseThe thalamus is a major integrating center for afferentimpulses. Maintenance of the internal environment is a function of the hypothalamus. Voluntary visual motor movements are controlled by the superior colliculi. Movements of the auditory system are accomplished by the inferior colliculi.49.Which is a characteristic of Wallerian degeneration? (select all that apply)Select all that apply.a. Swellingb. Neurofilamental atrophyc. Myelin sheath shrinkaged. Axon portion degeneratione. Overproduction of axonsa,c,dThe neurofilaments actually hypertrophy, and there is degeneration of axons distal to an injury. The other choices are all characteristic of Wallerian degeneration.50.The neurotransmitter released from the postganglionic parasympathetic axon a. acetylcholine.Both the pre- and postganglionic neurons of the parasympathetic nervous system release acetylcholine.
terminal is:The preganglionic neurons of the sympathetic nervous system release acetylcholine, while the postganglionic neurons release norepinephrine. Dopamine is produced by the hypothalamus. Preganglionic sympathetic fibers cause the rapid release of epinephrine.51.It is true that the brain's Broca speech area:b. is responsible for motor speech.The Broca area is found on the left and is responsible for motor speech. Deficits in this area result in the inability to form words, also called expressive or motor aphasia.