Innate Immunity

Innate Immunity

Author: Aaron Mullally

This lesson will describe innate immunity as the body's second line of defense against pathogens.

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Membrane Attack Complex; Creative commons: http://en.wikipedia.org/wiki/File:Complement_death.PNGComplement Pathways, Creative Commons: http://bit.ly/RPu52b; Histamine/polyhydroxy image, Public Domain: http://bit.ly/QBT3DB; Histamine/Toe image, Public Domain: http://bit.ly/VXX2Mn Thermometer; Creative Commons: http://bit.ly/hDq5K3

  • Antigen

    A unique marker found on the surface of cells that have the potential to stimulate an immune response; antigens are basically the identity marker of cells for the immune system to see.

  • Complement System

    A group of normally inactive proteins in the blood that are activated by antibodies during an infection; complement proteins join together to form a membrane attack complex that pierces cell membranes, causing damage to the pathogens that are invading us.

  • Innate Immunity

    Also known as non-specific immunity, innate immunity consists of general physiologic responses (fever, inflammation, etc.) that can affect the entire body.

  • Histamine

    A chemical secreted by mast cells and basophils that promotes inflammation by causing capillaries to become more permeable.