Breathing - Inhaling and exhaling air, Alveoli - Air sacs in the lung, Trachea - Breathing tube covered by epiglottis, Cartilage - soft bony material supporting Trachea, Capillary - Smallest blood vessels covering alveoli, Red Blood Cells - Contain hemoglobin to attach oxygen, Oxygen - The element needed for aerobic respiration, Carbon Dioxide - A compound the body gets rid of , Diaphragm - A muscle which controls breathing, Bronchus - These tubes extend from trachea to lungs, Bronchioles - Air tubes lined with smooth muscle, Mucus - Sticky substance for trapping particles, Cilia - These hairlike structures move mucus, Pneumonia - A viral or bacterial infection of the lungs, Asthma - Allergic reaction constricting bronchioles,

Respiratory System

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