*Which are chemical barriers to microbial growth found in the blood and interstitial fluid?

*The thymus

*During inhalation, air passes from the trachea into the right or left _____________.

*What is the epiglottis for?

*The T-cell maturation process involves them being able to:

*The most inferior region of the pharynx is the:

*Which structure is NOT in the UPPER respiratory tract:

*Which is the volume of air that is left in the lungs after maximal exhalation?

*Which structure is NOT in the lower respiratory tract:

*Which are structures helping to maintain the airway in the open position?