The intracranial volume that is most capable of compensating for increasing intracranial pressure is the:
A) Brain cell tissue
B) Intravascular blood
C) Surface sulci fluid
D) Cerebrospinal fluid
Ans: D
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Initial increases in intracranial pressure (ICP) are largely buffered by a translocation of cerebrospinal fluid (CSF) to the spinal subarachnoid space and increased reabsorption of CSF. Of the intracranial volumes, the tissue volume is least capable of undergoing change. Surface sulcus fluid is negligible and not a factor in increased ICP. The compensatory ability of the intravascular blood compartment is also limited by the small amount of blood that is in the cerebral circulation. As the volume-buffering capacity of this compartment becomes exhausted, venous pressure increases and cerebral blood volume and ICP rise.
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