The intracranial pressure of an adult in the standing position approaches zero mmHg because:
A) the intracranial pressure changes due to the increased respiration rate of a person standing erect.
B) as an adult moves from a recumbent position to a standing position the weight of the column of CSF is added incrementally to the pressure in the lumbar subarachnoid space and the intracranial pressure decreases.
C) as an adult moves from a recumbent position to a standing position the weight of the column of CSF is added incrementally to the pressure in the ventricles of the brain, and the intracranial pressure decreases.
D) the partial pressures of oxygen and carbon dioxide reach equilibrium, very nearly zero mmHg when a person stands up.
Question 2
Which of the following oxidase-positive, gram-negative rods can be differentiated from Vibrio cholerae based on its inability to grow on thiosulfate citrate bile salts agar?
A) Lactose fermenter that is also A/A on TSI, arginine positive, and resistant to both 10 g and 150 g O/129
B) Non-lactose fermenter that is also A/A on TSI, arginine negative, and susceptible to both 10 g and 150 g O/129
C) Lactose fermenter that is also A/A on TSI, arginine negative, and susceptible to both 10 g and 150 g O/129
D) Non-lactose fermenter that is also K/A on TSI, arginine negative, and resistant to 10 g O/129 but susceptible to 150 g O/129
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