Fill in the blanks 1. The ___________________ filters, moistens and warms air during inspiration. 2. The lower Respiratory system enables the exchange of gases to regulate serum ______,_______ and______. 3. Inhalation for deep breathing is to be done via _________. 4. Exhalation is done through the __________. 5. The _____________ is behind oral the nose. 6. The ______________ is where food and