As Plasma PCO₂ Increases

Question

As plasma PCO₂ increases,
A) hemoglobin synthesis increases.
B) ventilation increases.
C) vital capacity increases.
D) respirations cease.

Accepted Answer

As plasma PCO₂ increases, the chemoreceptors in the brainstem are stimulated to increase respiratory rate and depth, resulting in an increase in ventilation to decrease plasma PCO₂ levels. Hemoglobin synthesis and vital capacity are not directly affected by changes in plasma PCO₂. Respirations would not cease in response to an increase in plasma PCO₂, as the body has physiological mechanisms in place to regulate breathing and maintain homeostasis.