A key aspect of the specific immune system is:
1. recognition of common bacterial receptors.
2. complement.
3. memory.
4. phagocytes.
Correct Answer: 3
Rationale 1: The nonspecific body defense recognizes common bacterial receptors.
Rationale 2: Complement is part of the nonspecific body defense.
Rationale 3: The specific immune system forms memory cells after the resolution of infection.
Rationale 4: Phagocytes are part of the nonspecific body defenses.
Global Rationale: The body has the ability to mount a line of defense that is specific to certain threats. For example, a specific defense may act against only a single species of bacteria and be ineffective against all others. Important aspects of this immune response include specificity, being systemic, and having memory. The nonspecific body defense recognizes common bacterial receptors. Complement is part of the nonspecific body defenses. Phagocytes are part of the nonspecific body defenses.
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