21. The Immune System

What occurs during a primary immune response?

Which of the following best describes how the cell-mediated immune response will be affected by the activation of cytotoxic T cells?

Which line of defense includes active immunity?

Why would a body cell that is not a phagocyte need to present antigens?

What makes agglutination by antibodies possible?

Which cells are necessary for active immunity to occur?

Which type of immunity creates a memory against a particular pathogen?

Which type of immunity develops as a result of natural exposure to an antigen in the environment?

Which of the following confers passive immunity?

Which of the following cells are primarily involved in cell-mediated immunity?

Mechanisms of antibody action

Which of the following is an example of active immunity?

Which cells are primarily responsible for cell-mediated immunity?

Which of the following is NOT characteristic of the secondary immune response?

What is the cell responsible for a secondary cell-mediated immune response to an antigen?