____ are ventilators that measure and control inspiratory and expiratory time.

When the diaphragm contracts and the chest expands, the pressure inside the chest:

A) increases, then rapidly decreases. B) decreases. C) increases. D) stays the same.

Which BEST describes the metric system?

A) Uses inches and feet B) Uses increments of 10 C) Uses miles to measure length in miles D) None of the above