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26.The collateral blood flow to the brain is provided by the:a.Carotid arteriesc.Circle of Willisb.Basal arteryd.Vertebral arteriesANS: CThe arterial circle (circle of Willis) (see Figure 15-20) is a structure credited with the ability tocompensate for reduced blood flow from any one of the major contributors (collateral blood flow). The remaining options are not considered sources of collateral blood flow.PTS:1REF:Page 46727.The nurse recognizes that a patientÕs diagnosis of a viral infection of the brainÕs meningeal layer is supported by which diagnostic laboratory result?PTS:1REF:Page 479 | Table 15-8MULTIPLE RESPONSE
28.Which cranial nerves contain parasympathetic nerves? (Select all that apply.)PTS:1REF:Page 47329.The sympathetic nervous system primarily serves to protect an individual by doing which of the following? (Select all that apply.)PTS:1REF:Page 47630.The aging process brings about what changes to human cells? (Select all that apply.)a.Increased neurofibrillary tanglesd.Decreased myelin presenceb.Imbalance of neurotransmitterse.Altered dendrite structurec.Increased neuron productionANS:A, B, D, EPrincipal cellular changes associated with aging include a decrease in the number of neurons, decreased myelin, decreased number of dendritic processes and synaptic connections, intracel-lular neurofibrillary tangles, and an imbalance in the amount and distribution of neurotrans-mitters. The aging process does not bring about an increase in neuron production.PTS:1REF:Page 478 | Box 15-5