Trace the pathway the air through the respiratory system (2 X’s each) ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è ___________________ è alveoli

What structure carries lymph into a lymph node:

Which tonsil(s) is/are located in the oropharynx at the end of the soft palate:

The pharynogotympanic tubes, which drain the middle ear, open into the:

Functions of the nasal cavity include all of the following, except

Venous blood in systemic circulation is poorer in oxygen and richer in carbon dioxide.

Changes in the immune system that accompany aging include:

The respiratory zone includes the respiratory bronchioles, alveolar ducts, alveolar sacs, and alveoli.

Natural killers are unique phagocytic defense cells that can kill cancer cells and virus-infected body cells well before the immune system is activated.

Memory cells are descendants of an activated B or T cell.