write a one paragraph explanation of how the immune system works in helping to fight disease. You could do this under the flowchart.

The immune system is our body's defense mechanism against harmful pathogens, including bacteria, viruses, and fungi. It is composed of various types of cells and proteins that work together to fight disease. When a pathogen enters the body, it is recognized as foreign by the immune system, which triggers an immune response. This involves the production of specific antibodies by B cells, which are designed to target the specific pathogen. T cells, another type of immune cell, destroy the pathogen-infected cells. In addition, the immune system has a memory function that makes future responses against a specific pathogen more efficient. This is the basis of how vaccines work. By introducing a harmless part of the pathogen into the body, the immune system can 'learn' to recognize and fight it, preparing for future encounters with the actual disease-causing pathogen.