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By Evelyn B., Ph.d. Kelly, Claire Wilson

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Each bronchial tube then branches into smaller passages called the bronchioles, and then into even smaller branches that end in tiny air sacs in the lungs called alveoli. Here, oxygen is transferred from the alveoli to the capillaries in the circulatory system and carbon dioxide is transferred from the capillaries to the alveoli. The respiratory system fights invaders such as bacteria and viruses with several mechanisms. First, hairs called cilia in the nose filter out some of the particles. Cilia also line the trachea and bronchial tubes; they beat continuously in an upward motion to drive out bacteria, dust, and other foreign material.

Adults appear to work best on seven to eight hours. Many children and teens need more rest, perhaps nine or ten hours every night. Regular Exercise Cardiovascular exercise, such as walking, biking, or other aerobic exercise, boosts the immune system. During moderate exercise, cells in the immune system circulate more quickly through the body and are better at destroying bacteria and viruses. Although exercise does not prevent infection, it may help prevent severe symptoms and lead to a quicker recovery.

The History of Influenza tion was widespread on every inhabited continent. When this pandemic erupted, scientists were able to test it immediately in a laboratory setting and develop a vaccine. Public health officials established a vaccination program and observed firsthand the effects of the vaccine. This quick response probably saved millions of lives, but despite the new types of responses, the death toll from the Asian 14 flu was still at least 1 million and possibly as high as 2 million. In the early months of 1968, public health officials were alerted to a major flu outbreak in China.

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Influenza and Bird Flu. Examining the Flu by Evelyn B., Ph.d. Kelly, Claire Wilson


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