Where on the figure is the trachea?  Enter the corresponding letter for this structure.

What is the epithelium in the nasal mucosa?

Which cells in the alveoli produce surfactant?

This structure seals the nasopharynx during swallowing:

This structure prevents entry of food particles into the trachea upon swallowing:

The two main muscles of inspiration are the diaphragm and the internal intercostal muscles

These are the structures in the respiratory membrane:

What is the epithelium in “Q? 

What structure is labeled with a “B”?

MHC -1 is found on all body cells with a nucleus. It serves to expose intracellular pathogens.