Many body systems protect you from pathogens.

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Presentation transcript:

KEY CONCEPT The immune systems consists of organs, cells, and molecules that fight infections.

Many body systems protect you from pathogens. The immune system is the body system that fights off infection and pathogens. Many other tissues and systems help the immune system. Skin is a physical barrier to infection. Mucous membranes trap pathogens entering the body. The circulatory system transports immune cells.

Cells and proteins fight the body’s infections. White blood cells attack infections inside the body. Phagocytes engulf and destroy pathogens. T cells destroy infected cells. B cells produce antibodies.

Three types of proteins fight off invading pathogens. Complement proteins weaken pathogen membranes. Antibodies make pathogens ineffective. Interferons prevent viruses from infecting healthy cells. antibody pathogens

Immunity prevents a person from getting sick from a pathogen. In all immunity, pathogens are destroyed before you get sick. Passive immunity occurs without an immune response. mother’s milk genetics Active immunity occurs after a specific immune response

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