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23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus

23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus

Biology: The Dynamic Science (MindTap Course List)
Biology: The Dynamic Science (MindTap Course List)
4th Edition
ISBN:9781305389892
Author:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Publisher:Peter J. Russell, Paul E. Hertz, Beverly McMillan
Chapter44: The Circulatory System
Section: Chapter Questions
Problem 4TYK: A characteristic of blood circulation through or to the heart is that: a. the superior vena cava...
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23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus
Transcribed Image Text:23. An 85-year-old man has had progressive memory loss and difficulty walking over the past 2 months and occasional urinary incontinence over the past month. When he attempts to walk, he has difficulty starting and feels as if his feet are "glued to the floor." A CT scan shows marked dilation of all four ventricles and minimal cortical atrophy. Which of the following is the most like cause of these findings? A) Malabsorption of cerebrospinal fluid (CSF) by arachnoid granulations B) Obstruction of CSF flow at the cerebral aqueduct C) Obstruction of CSF flow at the interventricular foramen D) Overproduction of CSF by the choroid plexus E) Underproduction of CSF by the choroid plexus
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