What is the normal ratio of bicarbonate to dissolved CO2 in arterial blood?

When using the alligation grid, what goes in the top-left box?

A) The higher strength B) The lower strength C) The desired strength D) The desired quantity

Both inspiration and expiration are active in which type of high-frequency ventilation?

a. High-frequency positive pressure ventila-tion b. High-frequency oscillatory ventilation c. High-frequency jet ventilation d. High-frequency percussive ventilation