Answer
Alternative
d)
Work Step by Step
When the CO2 levels in the blood are high, the PH of the blood is low. This sends signals to the bulb to speed up gas exchange
Campbell Biology: Concepts & Connections (9th Edition)
by Taylor, Martha R.; Simon, Eric J.; Dickey, Jean L.; Hogan, Kelly A.; Reece, Jane B.
Published by
Pearson
ISBN 10:
0-13429-601-X
ISBN 13:
978-0-13429-601-2
Chapter 22 - Review - Page 469: 9
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