Body's defences and Immune system

Immune system and body's defences are semantically related. In some cases you can use "Immune system" instead a noun phrase "Body's defences".

Immune system noun - A system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response.

Body's defences and immune system are semantically related. You can use "Body's defences" instead a noun phrase "Immune system".