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What is alveoli?
The sacs that the bronchioles lead to in the lungs.
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What are the structures of the lymphatic system?
Lymph nodes, lymph vessels, bone marrow, tonsils, thymus, and spleen.
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What are the structures of the cardiovascular system?
Heart, blood, blood vessels, arteries, capillaries, and veins.
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What are the structures of the respiratory system?
Pharynx, larynx, alveoli, trachea, and bronchi.
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