The procedure is intermittent positive-pressure breathing (IPPB), 4 hours.

Trabecular or spongy bone.

A. cancellous bone B. endosteum C. peristeum D. compact bone

Which type of humidifier "traps" the patient's body heat and expire water vapor to raise the hu-midity of inspired gas?

a. Membrane b. Bubble c. Heat and moisture exchanger d. Passover