Answer
It lowers the pH.
Work Step by Step
CO$_2$ lowers the pH in blood and, through the same process, the pH of cerebrospinal fluid is largely determined by $CO_2$ concentrations in the blood.
Campbell Biology (12th Edition)
by Jane B. Reece, Lisa A. Urry, Michael L. Cain, Steven A. Wasserman, Peter V. Minorsky
Published by
Pearson
ISBN 10:
0135188741
ISBN 13:
978-0-13518-874-3
Chapter 42 - 42.6 - Concept Check - Page 946: 1
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