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Which 2 components do blood cells lack?

The central cardiac control region is in the _____ of the brain.

A person with blood type A+ has the following _________.

The function of interferons is to ____________.

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.