A pump used to clear an airway of obstructing liquid expands the volume in its chamber to produce a: A. negative pressure and liquid is pushed by atmospheric pressure into the chamber. B. positive pressure and liquid is pushed by atmospheric pressure into the chamber. C. negative pressure and liquid is sucked up into the chamber. D. positive pressure and liquid is sucked by atmospheric pressure into the chamber
Option A. Once a negative pressure is established through increasing the volume in the pump, atmospheric pressure appearing at the patient’s body will force air of their lungs out via the airway, at the side of the obstructing liquid.
