When the level of CO2 in the bloodstream increases, a. the...

When the level of $\mathrm{CO}_{2}$ in the bloodstream increases,
$a$. the rate of respiration decreases.
$b$. the $\mathrm{pH}$ of the blood rises.
$c .$ the respiratory centers become dormant.
$d$. the rate of respiration increases.
$e .$ the blood becomes more alkaline.

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Key Concepts

Chemoreceptor Function

Chemoreceptors, including both central chemoreceptors in the brainstem and peripheral chemoreceptors in the carotid and aortic bodies, play a vital role in monitoring blood levels of CO2 and pH. When CO2 levels rise, these receptors send signals to the respiratory centers, prompting an increase in respiratory rate to correct the imbalance.

Carbon Dioxide and Respiratory Regulation

Carbon dioxide (CO2) acts as a critical respiratory stimulus. Its accumulation in the bloodstream is closely monitored by the body, triggering an increase in the rate of respiration to expel excess CO2. This process helps maintain homeostasis by regulating the levels of CO2 and oxygen in the blood.

Acid-Base Balance

The increase of CO2 in the bloodstream affects the blood’s acid-base balance due to its conversion to carbonic acid, which lowers the pH of the blood. This alteration in pH is a key signal that influences respiratory rate as maintaining an optimal pH range is essential for proper cellular function and overall metabolic balance.

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