The immune system defends against pathogens from "summary" of Human Biology by Cecie Starr,Beverly McMillan
The immune system serves as the body's defense mechanism against harmful invaders known as pathogens. These pathogens can include bacteria, viruses, fungi, and parasites that have the potential to cause infections and diseases. When these pathogens enter the body, the immune system recognizes them as foreign entities and initiates a response to eliminate them.
The immune system is comprised of various components that work together to protect the body from pathogens. One key player in this defense mechanism is the white blood cells, which include lymphocytes, macrophages, and neutrophils. These cells play a crucial role in identifying and destroying pathogens through a series of complex processes.
When a pathogen enters the body, the immune system first recognizes it by identifying specific molecules on the surface of the pathogen. This recognition trig...
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