Which of the following is a part of the second line of defense against microorganisms?

A. keratin B. cilia C. gastric juice D. phagocytes

Low-grade fever is an effective defense for short periods of time because it
A. increases iron in the blood.
B. includes pyrogens that destroy the pathogens.
C. increases temperature, which slows the growth of bacteria.
D. slows the attack of phagocytes.
E. forces the person to stay in bed.

________ are released by activated T cells and macrophages to mobilize immune cells and attract other leukocytes into the area.

A. Cytokines B. Perforins C. Interleukin 1 proteins D. Interleukin 2 proteins