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Growth, Development, and Reproduction of Organisms: Human Body Systems
Immunity and Vaccination
Description
Immunity and Vaccination
Immunity is the body’s ability to defend itself against harmful pathogens like viruses and bacteria. It works through a system of specialized cells and molecules that recognize and destroy invaders. There are two types of immunity: innate (present from b...
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Transcript
Your white blood cells are constantly moving through your body, keeping watch. When they find a pathogen, they quickly jump into action to fight it off.
Most white blood cells, such as B and T cells, die after the infection is controlled, but some survive as memory cells that remember the pathogen.
If the same pathogen returns, these...
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