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1. blood ________________ red. respiratory bacterial carriage fight infection gases are known as leukocytes assist blood to clot 2. In the respiratory system humans, the actual exchange of carbon dioxide and oxygen molecules occurs in _____. bronchioles and alveoli of the trachea larynx 3. When gastric fluids irritate the lower esophagus frequent digestive trouble that outcomes is referred to as ______. peptic ulcer, hypertension, anemia acid reflux 4. Most of the absorption of nutrients from the food we eat occurs in the ____________. small intestine significant intestine esophagus stomach 5. The body's defense against bacterial infections and attacks by other foreign substances is the function of _____. Plasma platelet erythrocytes white blood cells 6. Respiratory illness caused by the destruction of cells and also the formation of scar tissue is known as _____________. Bronchitis, pulmonary emphysema, asthma Cancer
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