Homeostasis
When peripheral chemoreceptors detect an increase in the concentration of dissolved carbon dioxide in arterial blood above 45 mmHg (the upper limit of normal), which of the following homeostatic responses would occur?
Respiratory rate increases so that more carbon dioxide may be exhaled.
Respiratory rate decreases so that less carbon dioxide may be exhaled.
Respiratory rate increases so that less carbon dioxide may be exhaled.
Respiratory rate decreases so that more carbon dioxide may be exhaled.
Respiratory rate increases so that more carbon dioxide may be exhaled.
The homeostatic response opposes the stimulus, so if blood pCO2 is rising, the response must produce a decrease in pCO2. If respiratory rate increases, the increase in lung ventilation will blow off more CO2 (not less). This will lead to a decrease in the gas dissolved in arterial blood and a restoration of the healthy dissolved carbon dioxide concentration.
Respiratory rate increases so that more carbon dioxide may be exhaled. The homeostatic response opposes the stimulus, so if blood pCO2 is rising, the response must produce a decrease in pCO2. If respiratory rate increases, the increase in lung ventilation will blow off more CO2 (not less). This will lead to a decrease in the gas dissolved in arterial blood and a restoration of the healthy dissolved carbon dioxide concentration.
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