A)circulation of nutrients.
B)the transport of hormones.
C)defending the body against both environmental hazards and internal threats.
D)the production and distribution of plasma proteins.
E)both the transport of hormones and the production and distribution of plasma proteins.

A)CNS.
B)periphery.
C)renal arteries.
D)groin.
E)throat.

A)are all actively phagocytic.
B)destroy red blood cells.
C)respond to antigens.
D)are primarily found in red bone marrow.
E)decrease in number during infection.