Passive immunity is immunity transferred from one individual to another. Which statement describes passive immunity?

Passive immunity is immunity transferred from one individual to another. Which statement describes passive immunity?

• A. Immunity transferred from one individual to another
• B. Immune system responds to a harmful agent
• C. Gas Exchange
• D. Air Filtration

Answer: (A)

Passive immunity is immunity provided by antibodies that come from another individual or source, not produced by your own immune system. It happens when preformed antibodies are transferred—such as maternal antibodies crossing the placenta or antibodies in breast milk, or through therapeutic antibody preparations. This gives immediate protection against specific pathogens, but it’s temporary because the recipient’s own immune system isn’t activated to make those antibodies or to form memory cells for long-term protection. This differs from active immunity, where exposure to an antigen triggers the body's own immune response and builds memory, leading to longer-lasting protection. The other statements describe a general immune response or unrelated physiological processes, not the transfer of antibodies from one person to another.

Passive immunity is immunity provided by antibodies that come from another individual or source, not produced by your own immune system. It happens when preformed antibodies are transferred—such as maternal antibodies crossing the placenta or antibodies in breast milk, or through therapeutic antibody preparations. This gives immediate protection against specific pathogens, but it’s temporary because the recipient’s own immune system isn’t activated to make those antibodies or to form memory cells for long-term protection.

This differs from active immunity, where exposure to an antigen triggers the body's own immune response and builds memory, leading to longer-lasting protection. The other statements describe a general immune response or unrelated physiological processes, not the transfer of antibodies from one person to another.