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Human Circulatory System › View

Which part of the blood helps fight disease?

A. plasma

B. platelets

C. red blood cells

D. white blood cells

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Pulmonology › View

The paranasal sinuses, together with other structures of the upper respiratory tract,

A. are where a small percentage of gas exchange occurs.

B. form part of the respiratory membrane.

C. are involved in filtering, warming, and humidifying incoming air..

D. provide a large area for gas exchange between air and circulating blood.

E. are lined by a delicate simple squamous epithelium.

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