Which vitamin is an antioxidant that prevents the breakdown of certain tissues?

You are artificially ventilating an adult male patient who is in respiratory arrest with a bag-valve mask. Which finding would demonstrate that you are ventilating this patient properly?

A) Adequate chest rise and fall B) Ability to fully deflate the self-inflating bag C) Clear and equal breath sounds D) Ventilation rate of 20 breaths per minute

In a healthy adult at rest, what portion of the total energy output is required for the work of breathing?

A. 5% B. 15 % C. 25% D. 35%