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Which of the choices below is not a functional process performed by the respiratory system?  

Extra credit worth 2 points A virus has infected a cell. Fragments of viral proteins will be displayed on the surface of the cell by its ________ proteins and will activate a __________ .

When viewing a dissected heart, it is easy to visually discern the right and left ventricles by _________.

Carbon dioxide from tissue cells forms _______________________________ when combined with water. This compound dissociates in to H+ and _________________________, and participates in an important buffering system of the blood.

A child is vaccinated with the flu vaccine. The vaccine most likely presents the body with ________________________  which activates the immune system to produce antibodies.  These antibodies would be produced by ___________________________.

These vessels carry oxygenated blood:

The portion of the endometrium that sloughs off during menstruation is:

Extra credit worth 2 points Excess K+ ions in cardiac tissue cause heart rate and stroke volume to ___________.

A man is hyperventilating. This causes a decrease of __________________  which, in turn ________________ the pH of blood.

Normally, menstruation occurs when ________.