Which of the following are true of the respiratory exchange…

Which of the following are true of the respiratory exchange ratio?I. It is the ratio of alveolar CO2 excretion to blood oxygen uptake.II. R = CO2/O2III. It is the ratio of oxygen uptake to blood alveolar CO2 excretion.IV. Its value is normally approximately 0.8.

Although an increased use of accessory ventilatory muscles c…

Although an increased use of accessory ventilatory muscles coupled with rapid, shallow breathing may signal impending diaphragmatic fatigue, which of the following signs is typically seen in critically ill patients with ventilatory failure and diaphragmatic fatigue?