<prompt> Respiratory burst is related to:Hyperventilation after a period of apneaApnea after a period of hyperventilationSharp increase in O2 uptake and metabolism in neutrophilsNone of the above  <response>: Neutrophils cell membrane-bound enzyme nicotinamide adenine dinucleotide phosphate NADPH oxidase is activated on contact with a pathogen. Activation of NADPH oxidase is associated with a sharp increase in O2 uptake and metabolism in the neutrophil the respiratory burst and generation of superoxide O2- by the following reaction: The combination of the toxic oxygen metabolites and the proteolytic enzymes from the granules makes the neutrophil a very effective killing machine. 