The function of the exhalation valve is to do which of the following?
a. Adjust the flow going to the patient.
b. Close during exhalation to vent patient gas.
c. Seal the external circuit during inspiration.
d. Determine the volume being delivered.
ANS: C
During inspiration, gas fills the balloon and closes a hole in the expiratory valve. Closing of the hole makes the patient circuit a sealed system. During expiration, the balloon deflates, the hole opens, and gas from the patient is exhaled into the room through the hole.
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