The tube that connects the middle ear with the pharynx is the ____

At ________ years, a child should first be able to respond to the dentist's instructions

a. 2 b. 2 to 6 c. 10 d. 16

What of the following is one of the most prominent physiologic changes associated with aging?

a. decreased alveolar deadspace ventilation b. reduced airflow expulsion c. decreased PaCO2 d. increased DLCO