Immune system is

Immune system is

• A. A place in your body made up of organs and special cells that fight infection
• B. A network of nerves controlling movement
• C. A system of blood vessels carrying oxygen
• D. A set of bones providing structure

Answer: (A)

The immune system is the body's defense network that fights infection. The description that fits best is a place in your body made up of organs and special cells that fight infection, because it captures how the system includes lymph nodes, spleen, thymus, bone marrow, and white blood cells working together to detect and destroy pathogens. It’s not focused on nerves, blood vessels, or bones, which belong to the nervous, circulatory, and skeletal systems respectively. So this option correctly describes the immune system as the body’s infection-fighting system built from specific organs and cells.

The immune system is the body's defense network that fights infection. The description that fits best is a place in your body made up of organs and special cells that fight infection, because it captures how the system includes lymph nodes, spleen, thymus, bone marrow, and white blood cells working together to detect and destroy pathogens. It’s not focused on nerves, blood vessels, or bones, which belong to the nervous, circulatory, and skeletal systems respectively. So this option correctly describes the immune system as the body’s infection-fighting system built from specific organs and cells.