Your immune system is your body’s first-line defense against invaders like germs. It helps protect you from getting sick and promotes healing when you’re unwell or injured.

Mar 11, 2025 · The immune system is the body’s tool for preventing or limiting infection. Its complex network of cells, organs, proteins, and tissues enables the immune system to defend the body from …

It detects and responds to a wide variety of pathogens, such as viruses, bacteria, and parasites, as well as cancer cells and objects, such as wood splinters —distinguishing them from the organism's own …

Nov 29, 2025 · The immune system is a group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing entities. Immunity from disease is conferred …

The immune system works to keep germs and other foreign substances out of the body and destroy any that get in. It's made up of a complicated network of cells and organs.

Feb 3, 2025 · Your immune system defends your body against harmful invaders like viruses and bacteria, using white blood cells, antibodies, and other defenses to maintain health.

Apr 13, 2025 · The immune system is a vast, interconnected network of organs, cells, and molecules that protects your body from harmful substances, pathogens (like bacteria, viruses, and fungi), and …

. The immune system has two parts. There’s the immune function that you’re born wit. , called the innate immune system. The innate immune system is a general defense mechanism that protects you from …

All immune cells come from precursors in the bone marrow and develop into mature cells through a series of changes that can occur in different parts of the body.

There are many ways the immune system does these various functions. The immune system can tell the difference between cells that are yours and cells that do not belong in your body, like pathogens or …