A client's blood gas results reveal a low oxygen level. The nurse realizes that which area of the body will respond to this level and influence respirations?
1. Alveoli.
2. Trachea.
3. Bronchioles.
4. Carotid bodies.
Correct Answer: 4
Rationale 1: The alveoli do not respond to a low oxygen level.
Rationale 2: The trachea does not respond to a low oxygen level.
Rationale 3: The bronchioles do not respond to a low oxygen level.
Rationale 4: Special neural receptors sensitive to decreases in O2 concentration are located outside the central nervous system in the carotid bodies, just above the bifurcation of the common carotid arteries, and aortic bodies located above and below the aortic arch. Decreases in arterial oxygen concentrations stimulate these chemoreceptors, and they in turn stimulate the respiratory center to increase ventilation.
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