Multiple choice

The elemental regulating variable of the central chemoreceptors is

  1. PaCO2

  2. PaO2

  3. SaO2

  4. CaO2
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A Correct answer
Explanation

Special chemical receptors close to the aorta and carotid arteries are highly responsive to an increase in carbon dioxide or acid concentration, or to a decrease in the pressure of oxygen (PaO2). When these receptors sense acidity or low oxygen, they stimulate the brain respiratory centre to increase the speed and depth of breathing.

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