Health lesson 44
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| lymphocytes | white blood cells that help the body fight pathogens
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| B cell | a white blood cell that produces antibodies
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| anitbody | a special protein that helps fight infection
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| helper T cell | a white blood cell that signals B cells to produce antibodies
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| macrophage | a white blood cell that surrounds and destroys pathogens
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| immunity | the body's Resistance to disease-causing agents
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| active immunity | resistance to disease due to the presence of antibodies
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| vaccine | a substance containing dead or weakened pathogens that is introduced into the body to give immunity
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| passive immunity | immunity that results from introducing antibodies into a person's bloodstream
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| pathogen | a germ that causes disease
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| bacteria | single-celled microorganisms
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| toxins | poisonous substances
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| immune system | the system that removes harmful organisms from the blood and combats pathogens
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| Rickettsia | intracellular parasites that are classified as bacteria
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| fungi | a pathogen that includes single- or multi-celled parasitic organisms
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| virus | one of the smallest known pathogens
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| protozoa | tiny, single-celled organisms that produce toxins that cause disease
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| helminth | a parasitic worm
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Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
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