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 Lymph | The fluid that is collected by the lymphatic vessels and nodes |
| Lymphocytes | A type of white blood cell that helps your body fight pathogens (infectious organisms) |
| Lymph nodes | Small lymphatic organs that filter lymph and are found along the lymphatic vessels throughout the body |
| Thymus | The gland that produces "T" cells (which surround and destroy pathogens) that are ready to fight infection |
| Spleen | Lymphatic organ that that produces lymphocytes |
| Tonsils | Lymphatic tissue in the nasal cavity and at the back of the mouth that trap pathogens that enter the throat |
| Respiration | The process by which a body gets and uses oxygen and releases carbon dioxide and water by inhaling and exhaling |
| Pharynx | The passage from the mouth to the larynx and esophagus |
| Larynx | The area of the throat that contains the vocal cords and produces vocal sounds |
| Trachea | The tube that connects the larynx to the lungs |
| Bronchi | One of the two tubes that connect the lungs with the trachea |
| Alveoli | The tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged |