What is the primary role of the carotid body?

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Detects variations in the partial pressure of oxygen (Po2) in arterial bloodMonitors the partial pressure of oxygen (Po2) in venous bloodSenses changes in carbon dioxide levels (CO2) in arterial bloodTracks fluctuations in carbon dioxide (CO2) in venous blood

Explanation

The carotid body primarily functions to detect changes in the partial pressure of oxygen (Po2) in arterial blood, enabling the body to respond to oxygen level variations. It does not primarily monitor venous oxygen or carbon dioxide levels.