The Body's Line of Defense
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Health Grade: 7
Health Grade: 7
Sara - "We didn't understand yesterday's lesson. Can you explain it to us?" Miss Amber - "We learned that many healthy bacteria, called normal flora, live outside of your skin. Normally, the bacteria are not usually harmful, but sometimes, they can cause infections. Most of these organisms are considered "healthy" bacteria because they prevent very harmful bacteria, called pathogens, from growing on your skin."
Miss Amber - We also learned about white blood cells. Although your white blood cells account for only about 1 percent of your blood, their impact is significant. They flow through your bloodstream to battle viruses, bacteria, and other foreign invaders that threaten your health. When your body is in distress and a particular area is under attack, white blood cells rush in to help destroy the harmful substance and prevent illness.
Miss Amber - Another thing that we learned about is antibodies. They are large Y-shaped protein molecules created by the immune system to identify and neutralize foreign objects and pathogens, such as bacteria, viruses, fungi, parasites, and toxins. They are also known as immunoglobulin. Antibodies are manufactured by special white blood cells called B-lymphocytes, or B-cells. Sara and Jade - We understand now! Thank you!
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