What is the functioning of immune system? Discuss with examples.

The immune system is a complex network of cells, tissues, and organs that work together to defend the body against harmful invaders such as viruses, bacteria, fungi, and parasites. Its primary function is to recognize and eliminate pathogens or abnormal cells, such as those that may become cancerous. The immune system operates through various components, including white blood cells, antibodies, lymphatic system, spleen, and bone marrow, and involves both innate and adaptive immunity.

Innate immunity provides the first line of defense and is non-specific. This means it responds to pathogens in a generalized manner, without targeting a specific invader. The skin and mucous membranes act as physical barriers, preventing the __________ _____ __________ _____ _______.
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