* 免疫系： This is the body's overall defense system, made up of various cells, tissues, and organs. It's the primary defender against infection.
* 肌： The largest organ in the body, our skin acts as a barrier to prevent pathogens from entering.
* 粘膜： These line our respiratory, digestive, and urogenital tracts, trapping and expelling pathogens.
* Lymphatic System: This system circulates lymph fluid, which carries white blood cells that fight infection.
* 脾臓： This organ filters blood, removing old red blood cells and storing white blood cells.
* 骨髄： This is where white blood cells are produced.
* 胸腺： This gland plays a role in the development of certain white blood cells (T cells).
It's important to remember that all of these organs and systems work together to defend the body against infection.
