Active immunity is a form of acquired immunity in which the body does what?

Active immunity is a form of acquired immunity in which the body does what?

• A. Produces its own antibodies against disease-causing antigens
• B. Receives antibodies from another person
• C. Lacks an immune response
• D. Is immediately effective without exposure

Answer: (A)

Active immunity is when the body's immune system generates its own antibodies in response to a disease-causing antigen, such as after infection or vaccination. This involves B cells becoming antibody-producing plasma cells and memory B cells, which provide long-lasting protection. Because the body makes the antibodies itself and develops memory, this form of immunity lasts longer and can be more durable. The other scenarios don’t fit active immunity: receiving antibodies from another person is passive immunity, where the body isn’t producing its own antibodies. There isn’t an immune response in the sense of creating memory, and it’s usually temporary. Lacking an immune response isn’t correct, since active immunity relies on the body mounting a response to an antigen. It’s also not immediately effective without exposure, because there’s a delay while the body produces antibodies and memory cells after first contact with the antigen.

Active immunity is when the body's immune system generates its own antibodies in response to a disease-causing antigen, such as after infection or vaccination. This involves B cells becoming antibody-producing plasma cells and memory B cells, which provide long-lasting protection. Because the body makes the antibodies itself and develops memory, this form of immunity lasts longer and can be more durable.

The other scenarios don’t fit active immunity: receiving antibodies from another person is passive immunity, where the body isn’t producing its own antibodies. There isn’t an immune response in the sense of creating memory, and it’s usually temporary. Lacking an immune response isn’t correct, since active immunity relies on the body mounting a response to an antigen. It’s also not immediately effective without exposure, because there’s a delay while the body produces antibodies and memory cells after first contact with the antigen.