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The exchange of oxygen and carbon dioxide between alveolar air and blood is governed by _______.

The type of resistance that is acquired as a result of developing and recovering from a disease is ____________.

Any condition in which blood vessels are inadequately filled and blood cannot circulate normally is called __________.

Which layer of the pericardium is the tough outer most lining? 

Cytotoxic T-cells destroy their target cells by releasing a substance that affects _______.

Identify structures of the upper respiratory tract.

The vessels that project into the villi and absorb fatty substances is _______.

Hemoglobin has a tendency to release oxygen when pH is elevated.

The antibodies involved in allergic reactions _______.

The primary stimulus or stimuli for the respiratory center is/are _________.